piston orientation 4.5hp Evinrude 1980

[raczekp1]

i did the carb job, took out pistons, but i didnt pay atention which side should i put them back.
isnside piston are 2 marks( mark looks like arrowhead, and letter "L")
so "L" means low, and this side down?

 

[jonesg]

Re: piston orientation

Re: piston orientation

No wonder you got no reply.
What yr, hp and model engine.

When you say pistons, is that needle valves?

 

[boobie]

Re: piston orientation

Re: piston orientation

Better explain yourself better if you want any replies.

 

[Mas]

Re: piston orientation

Re: piston orientation

If you're looking at the "pistons," the "L" means loose side to remove the wrist pins...which there is no reason to remove. Still wondering why the pistons were removed? "Carb job" meaning carburator???? Or, "carb job" meaning removing built up carbon on the piston/rings/head??? If it's the later, there is an easier way with products like "seafoam," which do not require powerhead teardown.

Mas

 

[emdsapmgr]

Re: piston orientation

Re: piston orientation

The piston only goes back in the engine one way. The dome on the top of the piston must be in a specific orientation. The rod must also be correctly oriented. The small oil hole on the piston end of the rod must be facing upward during reassembly. That makes the rod/piston assembly either a right or a left. If you are asking these questions during reassembly, I'd suggest you get a factory service manual.

 

[raczekp1]

Re: piston orientation

Re: piston orientation

i took out pistons becouse i had stuck rings in one piston.
puting back i tought its good idea to put new rings at both pistons.
for me its not posible to get service manual

i'm working with 4.5hp Evinrude 1980,

i think this solution with piston orientation is the same as 6 hp, 7.5 hp, 9.9hp becouse spark plugs are locateg at the same side of head.

 

[SolingSailor]

Re: piston orientation

Re: piston orientation

The top of the piston will have two slopes. The steeper slope goes toward the intake ports. The lesser slope orients towards the exhaust ports. If there is an oil hole in the connecting rod, it must go upwards.

 

[emdsapmgr]

Re: piston orientation

Re: piston orientation

Yes, I must have been thinking of another engine...sorry for the misleading comment.

 

[raczekp1]

Re: piston orientation 4.5hp Evinrude 1980

maybe someone can add some photo, how should it look.
i'm thinking it should look like this one

 

[SolingSailor]

Re: piston orientation 4.5hp Evinrude 1980

That photo looks correct to me. A service manual would tell all.

 

[raczekp1]

Re: piston orientation 4.5hp Evinrude 1980

thanks for your hepl.Best to you