Hello,

I have a 2 year old Troy-built model 11A-542Q711 push behind mower. This is powered with a Honda 160CC GCV160A S3A. There is an oil leak coming from the cam shaft. There is a diagram online that shows an o ring that is probably the culprit. The question is, how do you remove the assembly to replace the 0 ring?

Camshaft is internal to the engine. The crankshaft is internal and external and where the blade attaches.

There are two ways to remove external seals.

1. push out from the backside when the engine is disassembled. Tap lightly with screwdriver. 0, 180, 90, 270 deg. And repeat until it's out
2. Pull out with an inside bearing puller when the engine is dissasembled.
3. Carefully drill two small holes in the seal. Insert a sheet metal screw in each a few turns. Pull carefully with vise grips on either side. With a new seal in hand, this should be obvious where to drill.

Make sure the shaft is clean before installing the seal. Lubercate the seal with engine oil before installing. Tap uniformly into place. A better way would be a U shaped block of wood.

Thanks for the answer. But I'm not sure if you know what part I'm referring to (I'm probably not describing it clearly. It's part of the camshaft pulley assembly on a Honda GCV160 motor. There is a link to the parts diagram and

http://www.css-club.net/honda/pp-service/data/13ZM00E7.pdf

E-10 is the diagram and I'm looking to replace the 0 ring on the assembly that is part 13 and replace it.

OK, took a quick peek, but I have to get some stuff done tonight.

Yep, it's an O ring.

I/you need to find the part number of the shaft on the cross reference and hopefully there is another diagram(s) of the shaft which will offer more help.

The part number for the shaft is 14324-ZL8-000. The o ring is 91301-ZM0-V31. I just can't figure out how you remove the shaft to replace the ring. I figured there was some trick but there's no indication on the diagram. Thanks again.

Look at E-3 and remove the rocker cover and take a peek.

I've never worked on an overhead valve lawnmower engine, but I have adjusted valves on an overhead valve automobile.

This thing has rocker arms and it looks like valve adjustments that need to be done. That's usually done by rotating the crankshaft until the intake valve is loose and at the timing mark and adjusting with a feeler gage and doing the same for the exhaust.

I'll bet that the rocker cover needs to be removed, but pay attention to the timing marks wherever they may be. You need to pay lots of attention to lots of things to get the engine to run again. Like, you need to pay attention to Intake, Compression, power, and exhaust strokes.

It might be too tough of fix.

Pop off the valve cover and have a look.

I agree, there appears to be something missing in the diagrams.

Here is a cut-away view of an horizontal shaft honda engine.

Precise Engine Repair - Honda General Purpose Engines (http://www.perr.com/honda.html)

Kiss, have you got this one going or what?

Nope, I'm guessing it's too complex for a DIY repair. They expect the belt to last the life of the engine, but I guess not the "O" ring. It looks like a large tear down, unless I'm missing something.