5hp Briggs has 20# compression

[reynoldston]

I replaced the head gasket and nothing changed. It was running but getting harder to start than wouldn't do it at all.
There doesn't seem to be any gasket between the cylinder head and base. So what does that leave? I cleaned the valve seats and top of piston. There is no scoring in the cylinder. This motor is on a tiller.

Are these motors only supposed to last a couple of years?

Thanks for any advice.

You start by saying you replaced the head gasket. Then you say there isn't a gasket under the head. That is very confusing to me? Seeing you have very low compression if the head gasket is missing you might start there. If you did replace the head gasket did you clean the head and cylinder real well? Have you got the valves adjusted right or a bent valve? Could the rings be stuck in the piston? All anybody can do here is just guess but you are the person working on the engine so you will have to look at everything till you see the problem which should be obvious when you find it.

 

[ba_50]

135202
1259E1
93021 3YB

On my Stihl chain saw the cylinder head comes off and there is a gasket on the bottom. The parts diagram indicates the cylinder head doesn't come off on this Briggs. That is what I was referring to, so the head gasket is new.

I used a wire brush to clean the valves. How do I know if they need adjusting?

This thing gets a lot of use so I don't think the rings could be stuck, but it wouldn't hurt to put some transmission fluid in the cylinder.

 

[Mikel1]

How do I know if they need adjusting?.

Check the valve clearances

 

[ba_50]

How do I measure the clearance? I have a Briggs repair manual but are they all the same?

 

[Mikel1]

Sent you a pm

 

[reynoldston]

135202
1259E1
93021 3YB

On my Stihl chain saw the cylinder head comes off and there is a gasket on the bottom. The parts diagram indicates the cylinder head doesn't come off on this Briggs. That is what I was referring to, so the head gasket is new.

I used a wire brush to clean the valves. How do I know if they need adjusting?

This thing gets a lot of use so I don't think the rings could be stuck, but it wouldn't hurt to put some transmission fluid in the cylinder.

A chain saw has a 2 cycle engine and nothing like a 4 cycle Briggs. I am completely confused here? I just never came across a Briggs engine that the head didn't come off. I sure would like to know more about this engine. If the head doesn't come off how do you get to the valves? I am way over my head on this one so someone who knows this engine better then I had better help you. I don't know how the valves even operate much less adjust them. Send a picture if you can. Always willing to learn something new.

 

[reynoldston]

135202
1259E1
93021 3YB

On my Stihl chain saw the cylinder head comes off and there is a gasket on the bottom. The parts diagram indicates the cylinder head doesn't come off on this Briggs. That is what I was referring to, so the head gasket is new.

I used a wire brush to clean the valves. How do I know if they need adjusting?

This thing gets a lot of use so I don't think the rings could be stuck, but it wouldn't hurt to put some transmission fluid in the cylinder.

OK all the Briggs experts just what am I missing here?? The best I can come up with is a 135202 flat or L head engine. This 4 cycle engine made like a 2 cycle chain saw engine??? I know about the time I would say there isn't such a thing someone will prove me wrong. Just can't find anything on it. I know trough the years they have made some strange engines. Just last week my son-in-law came home with what they call a hot tube engine which runs without a spark plug. :confused2:

 

[ba_50]

The bigger valve turns much more easily than the smaller one which according to utube might be letting to much compression through. It showed how to measure the valves , so that is next. I found the clearances too.

 

[ILENGINE]

Something I do, is when the valves are closed, I put my thumb on them and push and and see if they turn. If they turn they are not closing, and are leaking. The 1352 series should be a L head with 8 or 9 bolts with 1/2 hex heads that hold the engine head on.

 

[reynoldston]

Something I do, is when the valves are closed, I put my thumb on them and push and and see if they turn. If they turn they are not closing, and are leaking. The 1352 series should be a L head with 8 or 9 bolts with 1/2 hex heads that hold the engine head on.

If the engine is the 1352 series L head just remove the valve cover ( breather cover) and check your valve stem to lifter clearance.