Generac 15KW generator engine tear down

[tcartwri]

Thanks Tim! I read the link you sent me and it sure sounds like that is why it happened, especially being that temps were around 100 degrees and the generator was running at close to 100% load for days.

Funny, we have had the opposite environment destroy gensets because of the cold. We actually have to insulate them in an enclosure, or the moisture in the crankcase will turn the oil into a milkshake in very short order and push all the seals out of the motor. This is at -40~50C.....

 

[pclausen]

When they do the guides, the original is oversized slightly and then a new sleeve is pressed in and honed to size. The guides do 90% of the oil control. You would be far ahead of the game to go to a proper machine shop.

I dropped the heads of at a machine shop. The exhaust guides and valves are shot. They would prefer to replace the guides, but as I think I mentioned before, Generac doesn't offer them separately from what I can tell. They are going to check to see if they can get bronze sleeves in the right size and oversize the original guides and press them in sleeves as you suggest. You wouldn't happen to have a source for suitable sleeves, would you?

 

[murphy1244]

Try B&S parts.

 

[tcartwri]

I dropped the heads of at a machine shop. The exhaust guides and valves are shot. They would prefer to replace the guides, but as I think I mentioned before, Generac doesn't offer them separately from what I can tell. They are going to check to see if they can get bronze sleeves in the right size and oversize the original guides and press them in sleeves as you suggest. You wouldn't happen to have a source for suitable sleeves, would you?

Ummm... they should know where to source them.

Here's an online source,

K-Line Valve Guide-Liners

 

[pclausen]

I think part of the challenge is that the machine shop doesn't know the specs of the valve, like stem thickness or length. They are primarily an automotive machine shop.

 

[displacedPA]

I think part of the challenge is that the machine shop doesn't know the specs of the valve, like stem thickness or length. They are primarily an automotive machine shop.

I would sugest going on the Kohler or B&S whatever the engine manufature is and plug in the serial number. You can buy everything you need part by part. and it will tell you the spec on the vavle guides ect.

I have done this with many engines and has worked every time for me

 

[pclausen]

Hmm, I poked around the generac web site and it doesn't appear to have a section for entering an engine serial number to look for parts. It seems more end user oriented.

 

[murphy1244]

Peter, That is a briggs vanguard engine.

 

[pclausen]

I wonder how I would go about crossing this Generac GT990 Engine ID D8547, to the Vanguard equivalent. I'll poke around on Briggs site to see what I can figure out.

I also called Generac who put me in touch with a local service center. I'll contact them tomorrow to see what they can tell me about guide replacement.

 

[tcartwri]

Well, I can't for the life of me find the specs for these guides. I can find the finish reamer that Briggs sells for the job, but no dimensions anywhere. would really hesitate to recomend a number to you as well. Briggs does sell these heads as an assembly for about $140 ea, and that's the route I went with my V-twin but the guides in that motor were not serviceable. Hopefully someone else has a number in a manual somewhere.

http://www.industriasfita.es/Data/herramtrabajo.pdf