Is this motor worth repairing?

[kax2000]

Re: Is this motor worth repairing?

Yes, I pulled the plugs shot some oil in each cylinder waited 1 day and put it in gear, I could turn the engine over by spinning the prop by hand.

 

[mr 88]

Re: Is this motor worth repairing?

So you left the plugs out when you spun the prop by hand? I would turn it over by the flywheel which should have some notches on it which the spare rope with the knot at the end will hook up to.Is the recoil on your pull starter not engaging as well or is it engaging but you cannot turn it over that way?You will not get good compression numbers without a starter motor in operating condition.Check the solenoid and ALL wires for breaks.corrosion and bad contacts.See if you can get that starter motor to engage,priority one,sometimes you can tap it with a hammer and that frees up the bendix spring.Next step is compression test.After that check back with numbers and all these good guys that are helping you will advise as to what to do next.

 

[kax2000]

Re: Is this motor worth repairing?

So you left the plugs out when you spun the prop by hand? I would turn it over by the flywheel which should have some notches on it which the spare rope with the knot at the end will hook up to.Is the recoil on your pull starter not engaging as well or is it engaging but you cannot turn it over that way?You will not get good compression numbers without a starter motor in operating condition.Check the solenoid and ALL wires for breaks.corrosion and bad contacts.See if you can get that starter motor to engage,priority one,sometimes you can tap it with a hammer and that frees up the bendix spring.Next step is compression test.After that check back with numbers and all these good guys that are helping you will advise as to what to do next.

Yes, the plugs were out when I turned the prop.
I can pull the pull starter rope out the full distance, there is little resistance(not engaging), release pull starter rope it will recoil as normal. I assume the manual start needs repaired.

I freed up the bendix with a shot of oil and cleaned the shaft. The electric starter is now engaging.
Using a freshly charged battery and jumper cables to the starter the engine cranks very slow.
The compression check showed 85 on all cylinders.

 

[*EdC*]

Re: Is this motor worth repairing?

Yes, the plugs were out when I turned the prop.
I can pull the pull starter rope out the full distance, there is little resistance(not engaging), release pull starter rope it will recoil as normal. I assume the manual start needs repaired.

I freed up the bendix with a shot of oil and cleaned the shaft. The electric starter is now engaging.
Using a freshly charged battery and jumper cables to the starter the engine cranks very slow..The compression check showed 85 on all cylinders

85 is kinda low. You might want to first get some more Marval Mystery oil in it. At least an ounce per cylinder, then wait a few more days for it to do it's thing. And then consider dropping the lower unit and re-test

 

[mr 88]

Re: Is this motor worth repairing?

The motor has to crank fast to get a proper compression number.Figure out the starter problem,then proceed .Use Ed's advice as well.

 

[kax2000]

Re: Is this motor worth repairing?

When I crank the engine with the compression gauge in a cylinder the motor barely cranks over. With the gauge removed the engine will crank twice as fast...so I assume a very weak starter.

I am dropping of the starter for testing/repair at an auto electric shop.
They said some of the older starters like this one, the parts are not available.


Also,

Where is the best place to get replacement ignition wires....they have crimped screw in terminals at the cap end.

 

[mr 88]

Re: Is this motor worth repairing?

Compression = resistance in the case of your starter.That is why it spins faster with no plugs or gauge hooked up.Wires and starters can be found on Ebay or maxrules.com or oldmercs.com I am sure someone else will chime in with other sites..IF you cannot find anyone I have someone in my area with a ton of old Merc parts that are new and used in his inventory PM me.....BEFORE buying anything get a good compression reading,unless you do not care if you have to tear it down. .

 

[*EdC*]

Re: Is this motor worth repairing?

118209[/ATTACH]

When someone says that to me, It generally means... They can't be bothered. Starters are simple motors. Why not take it apart yourself? Heck, it just might be all gunked up and that is all

 

[kax2000]

Re: Is this motor worth repairing?

I took the starter apart and cleaned all of the black powder off that was caked on the inside of it.
The motor cranks normal with the compression gauge attached.
I am getting 105 to 110 on all cylinders.

 

[mr 88]

Re: Is this motor worth repairing?

Nice call EdC...Have you figured out the year and HP ? The compression is a bit low but may go up a bit after the oil works into the rings....So much for "they told me etc." in regards to your starter motor. Since you are not using it for racing I would say you will not have to take the head apart.The carbs and impeller are next in line.In a lot of the towers the starter comes out to get the carbs off,so you are getting to know Mr.Starter in a intimate way hahah.

 

[kax2000]

Re: Is this motor worth repairing?

1964 85hp.

I was going to rewire and check for spark while I wait for the carb and water pump kits to come in.
Is there a engine wiring diagram available for the '64 Mercury 850?



Not to get off subject...........I can get this motor(50hp) for free.
The owner says the engine runs but is stuck in forward gear. Worth fixing?

 

[ezmobee]

Re: Is this motor worth repairing?

Not to get off subject...........I can get this motor(50hp) for free.
The owner says the engine runs but is stuck in forward gear. Worth fixing?

I think that's an electric shift model (I could be wrong) in which case the toughest parts to get are in relation to the shifting so it could be tough to fix.

 

[mr 88]

Re: Is this motor worth repairing?

To the best of my knowledge the wiring should be colored coded.That includes the part/terminal that the wires go to,take a good look.You can also mark each wire and exactly where it goes as there are not a lot of wires to deal with.One other option is to google wiring diagrams for your motor or maybe try buying the manual which you can always use.


If that is a electric shift it may be a broken wire or solenoid.You will have to go to the Johnson/Evinrude forum for help.

 

[kax2000]

Re: Is this motor worth repairing?

He said I could have the motor for free ...but I have to take the boat and trailer with it.

 

[*EdC*]

Re: Is this motor worth repairing?

Grab it! What kind of boat is it?

 

[kax2000]

Re: Is this motor worth repairing?

He say's 1963 Fabuglas.
Can't find much info about them on the web though.

Push buttton?

 

[merc850]

Re: Is this motor worth repairing?

Good job on that starter repair, they're not hard to fix and parts are still available. I think that your motor is a 1969-70 Merc 800
Here's a wiring diagram for 70's 4 cylinder Thunderbolt ign. motors

 

[*EdC*]

Re: Is this motor worth repairing?

Good job on that starter repair, they're not hard to fix and parts are still available. I think that your motor is a 1969-70 Merc 800
Here's a wiring diagram for 70's 4 cylinder Thunderbolt ign. motorsView attachment 118593

The badges suggest it's a 1970. If the word "Thunderbolt" on the front cowling cover is in block letters, it's a '70. If it's in script, it's a '69. Although the '69 also has Merc800 decals on the side of the top cover, and I don't see any of those. Best bet is to get the serial numbers off the block. They are just behind the starter motor.. and.... he he.... YOU know were that is!

1970 face plate

 

[kax2000]

Re: Is this motor worth repairing?

Update on the '64 Merc 850 and the Fabuglas.

The person that I got the '64 850 from stopped by and showed me some old('70s or 80's) pics of the boat. Scanned them....what year is the Hydrodyne?....is it possible that the boat and motor was sold together?




I gave the Fabuglas to my friend. Spent all day helping him get it water worthy.
http://forums.iboats.com/showthread.php?t=521883

 

[jerryjerry05]

Re: Is this motor worth repairing?

Why pass on the Chrysler?
The cost to fix it?

The Chryslers are good running and there are tons of sites that sell parts.
They are easy to work on and like i said the parts are everywhere!!!
Some people won't work on them and turn their noses up at the Chrysler Force.Don't listen to them.J