Special tools, or is there another way?

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mattjeanes

Seaman Apprentice
Joined
Jan 29, 2003
Messages
46
I'm in the process of a rebuild of my 1974 15hp. Reading through the Clymer manual I find mention of removing and fitting piston wrist pins in a piston cradle and using a special tool to push the pins. Is the cradle necessary? Is there an easy alternative? What about pin pushing tools - can I use a suitable piece of bar? The manual also mentions a special tool for fitting the pin retainers - will pliers do? I live in inland UK where friendly marine mechanics are very hard to come (all I've got is a Mercury dealer nearby who wants to sell me a new one)by so any help will be much appreciated.
 
G

G DANE

Commander
Joined
Nov 24, 2001
Messages
2,476
Re: Special tools, or is there another way?

Hi Matt J<br /><br />There is a cheapo automotive tool, consisting of a band running around the piston, with a hole in it for the piston pin, and a nut at the other side. It has a long threaded pin with a T grip running thru it. With this you can turn the pin out. When reassembling, put pistons in the oven and pins in freezer, will go in easy.
 
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zantz

Seaman Apprentice
Joined
Aug 24, 2004
Messages
49
Re: Special tools, or is there another way?

Gdane is right, I just rebuilt my 60hp and did the same thing, heat the piston, freeze the pin. They slide right in with very little force. Another trick I asked about and got an answer to was the needle bearings. Use Vasoline to hold them in place while you slide the wrist pin in.
 
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R.Johnson

Rear Admiral
Joined
Sep 24, 2003
Messages
4,446
Re: Special tools, or is there another way?

Vasoline is a poor grease to use for a reassembly. It will hold the needle's in place while you put the part together. It has poor lubricating qualities, and will tend not to wash away on start-up. That's the reason for the OMC needle bearing assembly grease. As for wrist pin removal, remove retainers with needle nose pliers, drive out wrist pin with a deep socket while holding the piston in your hand. This is not difficult on this small engine. Use a brass, or plastic mallet when removing wrist pin.
 
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