NOT a spun hub?

[BUMP]

(89' OMC Cobra 2.3L, Sunbird/corsica 175)


Just had carb rebuilt, had new hub pressed at the prop shop. Guys told me at prop shop I had to run the boat for about 5 min at low speeds to allow the water soluble grease they use to dissipate before running at speed. Got back on the lake and did just that. I'm still having the same problem with High RPMs and no go. Got back home, put her in gear and I can spin the prop by hand,not to easy but with two hands it spins none the less. Is it supposed to spin at all? Am I dealing with something in the out drive? Can anyone point me into a direction from here? Am I looking at the notorious clutch dog? Thanks in advance again!

 

[Bondo]

Re: NOT a spun hub?

Ayuh,......

I Don't do OMCs,...... But,.......

If it's the dog clutch, or the coupler,....

You should be able to Hear some Noise when the prop is turned by hand,......

Use a "Stick Stethoscope" to narrow down the Problem,.........

 

[BUMP]

Re: NOT a spun hub?

I hear no noise to the naked ear anyhow when it I spin it. Should I be able to spin it at all in gear?

 

[Bondo]

Re: NOT a spun hub?

Ayuh,.......

It should Rachet in 1 direction,+ Lock Up in the other......

 

[Gary H NC]

Re: NOT a spun hub?

My bet is on a bad coupler...If it were gears you would think you would hear some noise at slow speed.
Any burnt rubber smell or black dust behind the engine?

 

[BUMP]

Re: NOT a spun hub?

Bad coupler, where and what is that??
"Any burnt rubber smell or black dust behind the engine?"

Not that I have noticed..

Gary
Thank you sir!
.

 

[Limited-Time]

Re: NOT a spun hub?

The coupler is what transfers the power from the engine to the input shaft on the out drive. It occupies the same place as the fly wheel on a manual transmission car.

 

[Gary H NC]

Re: NOT a spun hub?

Here is a picture of what it looks like...

http://www.ebasicpower.com/pc/VOL38...OMC+Rubber+Coupling+4.3L,+5.0L,+5.7L+SX.html%

 

[JustJason]

Re: NOT a spun hub?

The question is.... is the prop spinning but the propshaft is not? Or is the propshaft spinning along with the prop?

 

[HT32BSX115]

Re: NOT a spun hub?

Howdy,


There's actually 2 ways a coupler can fail.

1. The actual rubber "doughnut" in the coupler can fail and the evidence is a burnt rubber smell and rubber dust in the bilge....

2. The aluminum (inside) splines can fail in the coupler.

#2 is what happened to mine. It was only 39 years old (1966 150 Mercruiser)

When I got the engine out it appeared that someone had put the coupler on a drill press and drilled out the coupler. There were no (inside) splines at all. The steel yoke was fine.

Right before it failed it acted like it was momentarily jumping out of gear.

They fail for a few reasons.

alignment, lubrication, VERY old!


Cheers,


Rick

Bad coupler, where and what is that??
"Any burnt rubber smell or black dust behind the engine?"

Not that I have noticed..

Gary
Thank you sir!
.

 

[Coors]

Re: NOT a spun hub?

Turn the prop, and have someone watching inside the prop, to see if the hub is spinning on the shaft, or the shaft is turning.

 

[BUMP]

Re: NOT a spun hub?

OK, fellas, sorry it took so long to respond to this. I am fairly sure now you guys are on the money here. I remember now, last time I was on the lake, I remember I actually did see what I know can say was " rubber shavings" floating around in the little bit of water that was in my bilge. That being said! I can't find anywhere in my book were or how I replace the coupler. Can you guys tell me? How much would you think I would be looking at for the boat shop to repair it ( at there $85hr rate). Thanks so much for you help!

 

[HT32BSX115]

Re: NOT a spun hub?

1. remove the engine.
2. R & R the coupler
3. replace engine.

 

[BUMP]

Re: NOT a spun hub?

Pull engine, not out drive. got it thanks.

 

[Don S]

Re: NOT a spun hub?

Pull the outdrive first BEFORE you pull the engine. You have to have the outdrive off in order to align the engine when you put it back together, otherwise you will end up loosing another coupler.

 

[HT32BSX115]

Re: NOT a spun hub?

You need to get a service manual.


The drive usually needs to be pulled prior to pulling the engine on most I/O's

The whole mess MUST be aligned after you re-install the engine. The drive must be off to do the alignment.

You must get or make an alignment bar.

You need a service manual.

 

[BUMP]

Re: NOT a spun hub?

I got the crappy manual, the Clymer. How can I make an alignment tool? The boat shop quoted me 450 bucks to do it for me. He talking a month before he could get to it

He also so said I needed a special tool or press or something to get the old one out and back in??

Seems kinda straight forward, i'm thinking about doing this myself. He did said i didn't have to pull the engine completly out, but just enough to get to what needs getting to..

 

[Don S]

Re: NOT a spun hub?

How can I make an alignment tool? The boat shop quoted me 450 bucks to do it for me. He talking a month before he could get to it

You can buy brand new aftermarket alignment bars for around 75 bucks, used ones off ebay for 40 to 50 bucks. OEM for 100+. so why get one made. Think about it.

He also so said I needed a special tool or press or something to get the old one out and back in??

Old one what????

Sounds to me like your mechanic doesn't have a clue about boats.

 

[BUMP]

Re: NOT a spun hub?

You can buy brand new aftermarket alignment bars for around 75 bucks, used ones off ebay for 40 to 50 bucks. OEM for 100+. so why get one made. Think about it.

HT32BSX115 says:
"You must get or make an alignment bar."

I JUST ASSUMED that i could save the 40-100 bucks for the coupler.



Old one what????

I am still talking about the coupler...

Sounds to me like your mechanic doesn't have a clue about boats.

This is a possiblity..is why i am here..




Thanks


sorry i dont know how to quote like you all.. hope you get the idea anyhow

 

[Don S]

Re: NOT a spun hub?

The 40 - 100 bucks is for the ALIGNMENT bar to check and set the engine alignment.
The couplers cost about 300 bucks, on some (like the 460 OMC's) they bring almost 1500. That is for the coupler, not the labor to install it.
Depending on the shop, it could take a couple of days to do the job. Just depends on the equipment they have. Not a flat rate manual. Like it or not, tha is what you have to deal with.