Replacing Valve Seals

[prosales1]

Hello, I am new to this site and have learned alot from past posts about my Cart. I just bought a used 97 ezgo gas eh290 robin. Compression is 170 and 172.. New plugs, air filter, pcv hose, oil changed to 30 weight synthetic blend. Also I have adjusted the valves to .004. The cart smokes when you run it for 15 to 20 minutes... Dealers said that the valve seals are more than likely my problem... He said to pressurize the motor not drop the valves to replace the valver seals. My question is at what amount pressure do I need to maintain constant pressure so not to drop the valves and does this sound about right? I ordered the manual so I will have a guide....Any guidance or words of wisdom would be appreciated......Thanks

[pizzamaker]

Originally Posted by prosales1

Hello, I am new to this site and have learned alot from past posts about my Cart. I just bought a used 97 ezgo gas eh290 robin. Compression is 170 and 172.. New plugs, air filter, pcv hose, oil changed to 30 weight synthetic blend. Also I have adjusted the valves to .004. The cart smokes when you run it for 15 to 20 minutes... Dealers said that the valve seals are more than likely my problem... He said to pressurize the motor not drop the valves to replace the valver seals. My question is at what amount pressure do I need to maintain constant pressure so not to drop the valves and does this sound about right? I ordered the manual so I will have a guide....Any guidance or words of wisdom would be appreciated......Thanks

anything over 25lbs will be fine.

[prosales1]

Thanks for the feed back...I let you guys know what happens....

[ruredy]

Valve seals hardly go bad on these engines and I doubt they make your engine smoke for 15 to 20 minutes. I'd be interested to see if this cure works.
btw, I've always use at least 90 psi when changing seals but that's on car engines. don't see why it would be different on the robin engine but have yet to come across one that needs it.

[10w30dna]

I replaced the valve stem seals and it did stop the smoking. Fumbled a bit with big hands/small parts,but it DID fix the smoking when hot. Everybody used to yell when I went by looking like mosquito abatement vehicle! Now,nice clear exhaust and the seals were less than 10 bucks! 96 TXT cart. I slid the followers off to one side for each cylinder. Plug the oil drainback openings with paper towel and cover the surrounding area in case one of those keepers gets away!