Omc 800 stringer knocking and then no forward or reverse

[jp89bayliner]

The boat is a 1985 bayliner with a five liter omc v8. Out drive is a 800 series omc stringer. The boat ran great all day friday. I took the boat out of the lake and stored it by my camp site. The next day saturday launched the boat started it up and I heard a light ticking. I paid no attion to it as I had just checked all fluid levels and serviced the engine and out drive at the start of the season.

On my way out to the center of the lake I noticed the noise started to get louder so i decided to open the engine compartment and listen. It sounded like it was coming from the IM housing. So I decided to turn around and head for the dock. on my way in the noise started to get really loud and then a real hard vibration and then the boat just stopped going forward.

The engine kept running with no noise but the boat would not go forward. I tried reverse and nothing. Now that it is home I went out and put the boat in gear and with some force I can get the prop to turn both ways. When I do this the ball gears are not turning. I also noticed when Iam turning it sounds like the water impeller it trying to suck , like its trying to pick up water but will still turn. Iam pretty lost at this point. I used the search function with no answer and just looking for some tips to were I should be looking next. I do have my manuel but I dont know if it is the water pump shaft that is bad or if it is the cuppler, fly wheel or? Any help would be great thanks jp.

 

[chiefalen]

Re: Omc 800 stringer knocking and then no forward or reverse

Water pump shaft. Just happened to me.

Pull the water pump you will see the shaft stripped.

 

[jp89bayliner]

Re: Omc 800 stringer knocking and then no forward or reverse

Water pump shaft. Just happened to me.

Pull the water pump you will see the shaft stripped.

Were should I look for parts? I do have my manuel but how hard is it to replace? Any tip's Ideas on doing the water pump shaft. Should I be looking for for any thing else while I am in there, stripped broken gear sets etc. Thank's for the reply. Did you replace your's your self of have a shop do it. How much would i expect to pay for a job like this. thanks jp

 

[jp89bayliner]

Re: Omc 800 stringer knocking and then no forward or reverse

Bump ^^^^^^

 

[NW Redneck]

Re: Omc 800 stringer knocking and then no forward or reverse

Yup, sounds like the water pump shaft. Let me see if I can scan a pic..........


Here's your uppper gearcase:

The suspect in question is #35, just under the blue circled part. (that was for me )

Here's a closeup:

If you're lucky, then the splines(male or female) stripped on this shaft. If not so lucky, the splines on #47 may hare stripped. The waterpump is fairly easy to get to (corroded bolts asside ). I just did mine (new impeller) this year. The upper driveshaft/gear assembly #43 takes careful shimming and some special tools IIRC. Cross your fingers!

 

[chiefalen]

Re: Omc 800 stringer knocking and then no forward or reverse

Not hard to do at all. I did it myself. And so can you. Have a chair or small table ready when you drop the lower. Drain the upper unit.

No need to remove cable. Lift drive up about 10 degrees. Remove top bolts.

Drop the exhaust and lower together. Place on chair right next to drive with cable. Careful don't pull the cable expensive. I tied the lower to my swim platform.

Pull the 4 bolts that hold the water pump and shafts. It comes out in all one unit.

Might be tough to get it out. I tapped mine out. Gently!

When you get it out take it apart. You'll see whats stripped.

Replace the impeller when you put it back together.

Careful with the shims.

Ok knowing what i know now, i would replace what shaft striped.

Replace impeller, and put it back together. After its bolted together i would remove the whole drive. With the cable still in. Put it just to the side and tie it up, and pull the ball gear shaft and check the splines.

It's the one that comes out of the transom. Drain the gear oil in the intermediate, before you pull the shaft. My coupler went first, than the water pump shaft a week latter, i got stuck on the water twice.

How are the ball gears?

Grease the shaft splines real good when you put it back in. How many teeth on your splines mine had 18.

Makes a difference if you have to replace the coupler, better you know now in the driveway than on the water when the coupler strips out.

You did overheat when it happened?

Make sure you fill the drives you drained with gear oil.

When your at it might as well grease the zerks behind the rubber bumpers.

And lift the drive all the way up on the front side of the drive half way up there is a zerk fitting in a hole grease that real good.

And the turning gear, tilt gear.

Post how you made out or any problems.

Good luck!

 

[THE BEEF]

Re: Omc 800 stringer knocking and then no forward or reverse

Not hard to do at all. I did it myself. And so can you. Have a chair or small table ready when you drop the lower. Drain the upper unit.

No need to remove cable. Lift drive up about 10 degrees. Remove top bolts.

Drop the exhaust and lower together. Place on chair right next to drive with cable. Careful don't pull the cable expensive. I tied the lower to my swim platform.

Pull the 4 bolts that hold the water pump and shafts. It comes out in all one unit.

Might be tough to get it out. I tapped mine out. Gently!

When you get it out take it apart. You'll see whats stripped.

Replace the impeller when you put it back together.

Careful with the shims.

Ok knowing what i know now, i would replace what shaft striped.

Replace impeller, and put it back together. After its bolted together i would remove the whole drive. With the cable still in. Put it just to the side and tie it up, and pull the ball gear shaft and check the splines.

It's the one that comes out of the transom. Drain the gear oil in the intermediate, before you pull the shaft. My coupler went first, than the water pump shaft a week latter, i got stuck on the water twice.

How are the ball gears?

Grease the shaft splines real good when you put it back in. How many teeth on your splines mine had 18.

Makes a difference if you have to replace the coupler, better you know now in the driveway than on the water when the coupler strips out.

You did overheat when it happened?

Make sure you fill the drives you drained with gear oil.

When your at it might as well grease the zerks behind the rubber bumpers.

And lift the drive all the way up on the front side of the drive half way up there is a zerk fitting in a hole grease that real good.

And the turning gear, tilt gear.

Post how you made out or any problems.

Good luck!

Your saying you can remove the lower unit and have enough cable to rest it on somthing?

 

[chiefalen]

Re: Omc 800 stringer knocking and then no forward or reverse

Yes. Did it many many times. I use a old chair and maybe a milk crate.I put the chair right next to the drive and transom on the port side.

Don't pull on the cable. I tie it to the swim platform.

When i take the whole drive off i put the drive down but about 2 inch's from all the way down.

I put a flat piece of pine under the skeg. Than i crank the trailer up till the skeg sits on the wood.

I remove the trunion caps and when it's free i just crank the trailer up one or 2 inchs and just swivel the whole drive to the left and there is enough room to pull the shaft.

Thats how i do it.

 

[jp89bayliner]

Re: Omc 800 stringer knocking and then no forward or reverse

Not hard to do at all. I did it myself. And so can you. Have a chair or small table ready when you drop the lower. Drain the upper unit.

No need to remove cable. Lift drive up about 10 degrees. Remove top bolts.

Drop the exhaust and lower together. Place on chair right next to drive with cable. Careful don't pull the cable expensive. I tied the lower to my swim platform.

Pull the 4 bolts that hold the water pump and shafts. It comes out in all one unit.

Might be tough to get it out. I tapped mine out. Gently!

When you get it out take it apart. You'll see whats stripped.

Replace the impeller when you put it back together.

Careful with the shims.

Ok knowing what i know now, i would replace what shaft striped.

Replace impeller, and put it back together. After its bolted together i would remove the whole drive. With the cable still in. Put it just to the side and tie it up, and pull the ball gear shaft and check the splines.

It's the one that comes out of the transom. Drain the gear oil in the intermediate, before you pull the shaft. My coupler went first, than the water pump shaft a week latter, i got stuck on the water twice.

How are the ball gears?

Grease the shaft splines real good when you put it back in. How many teeth on your splines mine had 18.

Makes a difference if you have to replace the coupler, better you know now in the driveway than on the water when the coupler strips out.

You did overheat when it happened?

Make sure you fill the drives you drained with gear oil.

When your at it might as well grease the zerks behind the rubber bumpers.

And lift the drive all the way up on the front side of the drive half way up there is a zerk fitting in a hole grease that real good.

And the turning gear, tilt gear.

Post how you made out or any problems.

Good luck!

Ok the ball gears are great only two seasons old, that was the first thing I checked when the boat stopped moving. The boat never got a chance to over heat. As soon as I heard the harsh vibration I shut the boat down. I went to the back of the boat and checked thing's over in the water. I then started the boat agian and tried to move forward and nothin so i shut it off agian.
That is when a really nice guy drove by and asked if we were ok and then towed us in.

What kind of gaskets will I need and were is the best place to look for parts? I am kind of on a budget and will be doing all the work my self. i will have to save up and fix it this fall. thanks for the help jp.

 

[jp89bayliner]

Re: Omc 800 stringer knocking and then no forward or reverse

Yup, sounds like the water pump shaft. Let me see if I can scan a pic..........


Here's your uppper gearcase:

The suspect in question is #35, just under the blue circled part. (that was for me )

Here's a closeup:

If you're lucky, then the splines(male or female) stripped on this shaft. If not so lucky, the splines on #47 may hare stripped. The waterpump is fairly easy to get to (corroded bolts asside ). I just did mine (new impeller) this year. The upper driveshaft/gear assembly #43 takes careful shimming and some special tools IIRC. Cross your fingers!

One other question. Is the water impeller and water impeller shaft located in the lower unit or in the top. Thanks JP

 

[NW Redneck]

Re: Omc 800 stringer knocking and then no forward or reverse

The breakdown pic is of the UPPER gearcase. 5 bolts and part #72 comes off.
Then you lift the whole upper gearcase out of the drive like so.......

Take out the 4 bolts (#41) and the impller housing and shaft comes out.

 

[chiefalen]

Re: Omc 800 stringer knocking and then no forward or reverse

You need a water pump repair kit with the housing. It's a whole kit complete.

E-bay 65 with shipping. I think. 400-800 drive same kit.

No need to remove the whole drive. Just the lower.

In the last month i had the whole drive off to replace the coupler.

Than i had to remove the lower to replace the shaft. Actually both water pump shafts.

Any one can do it.

 

[chiefalen]

Re: Omc 800 stringer knocking and then no forward or reverse

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=320244984967

http://bpi.ebasicpower.com/c/OMC3G/Shafts,+Upper+Unit+for+OMC

dg marine on ebay is where i got my bearing shaft. Cheapest i could find.

basic power cheapest i could find water pump shaft. Might be one or the other stripped i found when one goes they both go.

I would check the coupler better you find out in the driveway than on the water.

If you find the coupler went than email me. i know a guy with cheap parts.

 

[jp89bayliner]

Re: Omc 800 stringer knocking and then no forward or reverse

Tommorow is the day I am going to tear it down. I will let you guy's know how I make it out. Thank's for the help.

 

[jp89bayliner]

Re: Omc 800 stringer knocking and then no forward or reverse

Ok got the lower off. The verdit is the water pump shaft is hammered dog meat. the other shaft is ok. What would cause this in just about 100 hours of use?

Cheap parts maybee? I am not sure what happend but when I pulled the drain plug for the upper to let the lube out the plug had alot of metal shavings on it. The water imppeller still looks great. I guess I need to keep looking to see what made this thing self destruct.

Any other ideas why this thing took such a crap so soon. The first one lasted 500 hours plus what gives. Thanks for the help JP

 

[chiefalen]

Re: Omc 800 stringer knocking and then no forward or reverse

You grease the splines real good.Put that rubber seal on the splines when you put together the water pump back together.

S--t happens. You know where to get them. Get new.

 

[jp89bayliner]

Re: Omc 800 stringer knocking and then no forward or reverse

Ok gentlemen we have a problem. I replaced the water impeller drive shaft I started it up and a no go. I am not sure if the upper has siezed or the intermited has siezed. This is what I do know. The shaft is slightly twisted were it goes in to the upper drive.

My first thought is the lower drive as it looks like it tried to twist the water pump shaft that goes into the upper drive, do you guys get what I am saying or have I lost you.

So I installed the the water impeller shaft into the lower and put the boat in gear. I can trun the shaft and the prop will spin when I turn the water pump shaft, of course the lower is off the upper at this point. I also know that I can rotate the motor with a braker bar and the ball gear on the intermited housing spins because I marked it and spun the ball gear 360 deg. At that point it felt like locked up a little so I stopped.

Any body have any ideas? Thank's for any help JP

 

[THE BEEF]

Re: Omc 800 stringer knocking and then no forward or reverse

Ok gentlemen we have a problem. I replaced the water impeller drive shaft I started it up and a no go. I am not sure if the upper has siezed or the intermited has siezed. This is what I do know. The shaft is slightly twisted were it goes in to the upper drive.

My first thought is the lower drive as it looks like it tried to twist the water pump shaft that goes into the upper drive, do you guys get what I am saying or have I lost you.

So I installed the the water impeller shaft into the lower and put the boat in gear. I can trun the shaft and the prop will spin when I turn the water pump shaft, of course the lower is off the upper at this point. I also know that I can rotate the motor with a braker bar and the ball gear on the intermited housing spins because I marked it and spun the ball gear 360 deg. At that point it felt like locked up a little so I stopped.

Any body have any ideas? Thank's for any help JP

The first one lasted 500hr,what happened?
What I would do first is pull the drive.
Check the inter.housing first,then pull the upper and lower apart.
Open up the upper and find where that metal came from.
Thats what I would do first.
Let us know whats going on.

Beef

 

[jp89bayliner]

Re: Omc 800 stringer knocking and then no forward or reverse

The first one lasted 500hr,what happened?
What I would do first is pull the drive.
Check the inter.housing first,then pull the upper and lower apart.
Open up the upper and find where that metal came from.
Thats what I would do first.
Let us know whats going on.

Beef

Well after talking with chiefalen over the phone we finaly got it figured out. I can say this much it is not good. He helped my find that the gear set is gone. The bearing on the top of the upper shaft has frozen solid causing the gears to tear apart.

When I removed the water impeller and shaft I left the upper part of the housing in. Because when I pulled out the water impeller I could clearly see that that the shaft slpined were gone. well after wasting 75 dollars and half a day I screwed up that shaft too. I guess I learned that the hard way!

So chieflalen was kind enough to help me with some parts, thank you very much for your time chiefalen for that and for taking time out of your day to help to talk with me over the phone and every one else that has helped to this point. I guess I still will need some help on repairing this.

 

[THE BEEF]

Re: Omc 800 stringer knocking and then no forward or reverse

Hey JP
There is a 800 stringer upper gear box on E bay right now,It said it was used in fresh water only. last bid was $355.00.
6hr left
Go to E BAY and type 800 stringer.

Beef