Engine re-ring questions

[Robj]

Hello,

This is the first time that I have ventured into re-ringing an outboard engine. It is a early 1980's vintage 7.5 hp Johnson. I have it all torn apart, honed the cylinders and ready to put the pistons back in. I have a few questions:

How do you assemble the roller bearing so that they do not fall all over the place. Do you glue them in with grease?

What type of sealer do you use to seal the halves of the crankcase? There is no gasket but it appears that there was some type sealer between the halves. Just wondering what type I should use?

Does anyone know the torque specs for the connecting rods and the crankcase bolts?

Thanx for your help and have a great day.

Rob.

 

[flabum]

Re: Engine re-ring questions

OMC makes a needle bearing grease to hold the bearings in place, I always used petroleum jelly. (another use fro Vaseline) The sealer that the book calls for is GEL Seal. It can be bought online or at a local dealer. I do not know the torques on that motor, all my books are at work.

 

[Robj]

Re: Engine re-ring questions

Thanx for your response flabum. Will get some vaseline, for the bearings. Wife might look at me funny when I walk in the house with a large tub of vaseline. Would some black RTV work to seal the halves? Would like to get it together tommorrow and the dealer is closed. If not will have to wait until Monday.

Thanx and have a great day,

Rob.

 

[Silvertip]

Re: Engine re-ring questions

Use the recommended sealer on the crankcase halves. RTV is not recommended in that application.

 

[Robj]

Re: Engine re-ring questions

I guess I will have to wait until Monday to get the right stuff. Thanx for your replies.

Have a great day,

Rob.

 

[jbjennings]

Re: Engine re-ring questions

Rob,
I'm glad you asked those questions, I've been wanting to know the answers to the same ones myself. If you don't mind me asking, was it a hard job and did you hone 'em yourself? Did you install the rings yourself? I'd sure like to hear the report after you get it back together as far as how it runs, etc.
JBJ

 

[rodbolt]

Re: Engine re-ring questions

use gel seal or the loctite equivalent, I think its like 747 .
its an anerobic sealent. DO NOT USE silly cone anywhere on that motor.
just say no.
only two sealents you need are gel seal and BRP gasket maker.
use vasilene to hold the needles in place, pay careful attention to the parting line on the rodcaps before tightening or you will destroy the rods.
about now a service manual would come in right handy.

 

[Robj]

Re: Engine re-ring questions

Thanx Rodbolt for your response. I agree that I need a manual, but unsure if I will keep this engine, need one for a kicker, have 12 in the garage to choose from. It was a tired motor that I paid very little for. Just took it apart to see if I could get it running. For my keeper engines I do have manuals.

jbjennings it is easy to take them apart. The only challenging thing will be with those darn needle bearings, getting them in place and to stay. It will be a little tricky. Like I said, I had very little to lose by taking this engine apart. I would never do the same with my 40 Merc, too expensive to experiment with. Will probably go to the library to photocopy a few pages of the manual that are relevant to what I am doing. As far as honing the cylinder walls, I used a brake cylinder hone, wetted with solvent and it seemed to work great. The cylinder is only 2'' in diameter. The rings you just put them on carefully by hand. Very easy so far. Have done automotive and bike engines before, but this is the first time for an outboard.

Have a great day,

Rob.

 

[reeldutch]

Re: Engine re-ring questions

when ever i install needle bearings for the wrist pin,
i get a plastic tube/pipe with exactly the same diameter as the wrist pin and cut a little longer than the wrist pins so the washers will fit over the tube.

than i put the plastic tube in the connecting rod and install the bearings with vaseline in between the connecting rod and plastic pipe. slide the washers over the tube and line the assembly in the piston .
orientate the wrist pin and piston correctly.
oil whole from connecting rod face up.
piston has exhaust and intake side.

than when i have it lined up i use just 2 stroke engine oil and lubricate the wrist pin and piston.
than i drive it in and put the circlips on.

is all sounds harder than it really is.
biggest problem is to find the right diameter plastic pipe.

good luck

 

[hawkman222]

Re: Engine re-ring questions

Anouther thing to look at are the ports. Maybe not as big a deal on a hone as a rebore, but the the edge of the ports where they open up into the cylinder should not be sharp. I just bought a 1979 140 hp Evinrude that had been rebuilt and soon thereafter started running poorly. I bought it cheap. Turns out there were broken rings in two of the holes and the edges on the ports were so sharp they'd cut you when you ran your finger across them. If they are sharp, just run a little piece of 220 wet dry around the edge to knock it down. It doesn't take much. If a machine shop does the work, they call it chamfering the ports. As far as an 80's motor being 'vintage' I consider that practically new!