782 MOTOR COMPRESSION QUESTIONS

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782 MOTOR COMPRESSION QUESTIONS; 782 MOTOR COMPRESSION QUESTIONS
Topic Started: Mar 15 2009, 05:42 PM (192 Views)
wig	Mar 15 2009, 05:42 PM Post #1
Posts: 20 Group: Members Member #195 Joined: December 26, 2007	The 782 I bought has low compression.One cylinder is 90lbs and the other has 30 lbs of compression.My questions are. Is it possible to be related to just head gaskets?Next is it possible to be just in need of new rings.Next can the rings be replaced without pulling the motor.And is it going to need more than rings. Thanks for any help.



lsmurphy	Mar 15 2009, 06:16 PM Post #2
Posts: 118 Group: Members Member #406 Joined: October 20, 2008	Answers are yes and yes. I looked at a 682 sometime ago that has so much blow-by at the gasket you could see it with each stroke. The jugs come off on these and you can replace the rings, hone your cylinders and have your valves ground without tearing the entire motor down. Find a kohler service manual and you'll better understand. In fact I have one to do myself when I get around to it. Scott



Matt G.	Mar 15 2009, 06:32 PM Post #3
Posts: 60 Group: Members Member #609 Joined: January 27, 2009 State of Residency Illinois	Valves would be another thing to look at as well.



wig	Mar 15 2009, 08:03 PM Post #4
Posts: 20 Group: Members Member #195 Joined: December 26, 2007	Forgot to mention have not had it running yet.Would you first try head gasket?Also what do I need to look for with the valves?



Matt G.	Mar 15 2009, 08:39 PM Post #5
Posts: 60 Group: Members Member #609 Joined: January 27, 2009 State of Residency Illinois	A leakdown tester would be handy. That way, you'd be able tell where the leak is. It would be obvious the head gasket was leaking, or the valves, or the rings. Air coming out of the intake or exhaust would indicate bad valves, out the the breather means the rings are shot, and a leaky head gasket will be very apparent as well. If you remove the valves, you can inspect them (and the seats) for wear as per the manual.



lsmurphy	Mar 15 2009, 09:00 PM Post #6
Posts: 118 Group: Members Member #406 Joined: October 20, 2008	I would first pull the heads off and inspect. You'll know by the condition of the gasket it that's what it is. Then rotate by hand and inspect the valves as they open and again it should be obvious to you as you look at the valve and seat. Scott I'm guessing based on quotes locally that each jug and valve job will run you about 70 to $80 per side not including rings, valve seats and guildes and gaskets. whole job might run you about $190. Don't do just the one side thinking you'll save a couple of bucks, probably cost you more in the long run.



ihc353s	Mar 16 2009, 07:40 AM Post #7
Posts: 57 Group: Members Member #423 Joined: October 25, 2008	Hi, i have the same Problem with my 782, the right Cilinder doesn't work, but the Ignition is ok, and have good flashes. The Valves are working, and the Engine starts right up on one Cilinder, and runs, but without the right Power. Today i will bring the Engine to a Engine Rebuilder, to check it. I hope, i can get the Parts, we need, to rebuildt the Engine. The Crankshaft Bearing hav much play too, the Engine runs 3313 Hours in his Live. mfg Georg :Cub5



lsmurphy	Mar 16 2009, 09:10 AM Post #8
Posts: 118 Group: Members Member #406 Joined: October 20, 2008	lsmurphy Mar 15 2009, 09:00 PM I would first pull the heads off and inspect. You'll know by the condition of the gasket it that's what it is. Then rotate by hand and inspect the valves as they open and again it should be obvious to you as you look at the valve and seat. Scott I'm guessing based on quotes locally that each jug and valve job will run you about 70 to $80 per side not including rings, valve seats and guildes and gaskets. whole job might run you about $190. Don't do just the one side thinking you'll save a couple of bucks, probably cost you more in the long run. Hate to say it but is sounds like you lost a rod. This must cost you a fortune over there for repairs. Scott



Bob Balk	Mar 16 2009, 07:32 PM Post #9
Posts: 27 Group: Members Member #655 Joined: February 27, 2009 State of Residency New York	Georg, I travel to Bonn several times a year. If you need parts and are near Bonn I would be glad to bring them over. Bob



ihc353s	Mar 17 2009, 08:50 AM Post #10
Posts: 57 Group: Members Member #423 Joined: October 25, 2008	Hi Bob, thanks for your Offer. What are you doing in Bonn, are you in the Army? I'm Not near Bonn, i'm near Munich(M�nchen), to Bonn i have ca. 500 Miles, but i hav a Friend, who works in Bonn, i will meet him at next, in May, and his English is much better, than mine, lol. I ask him for help, bacause i think, it'sno Problem, but first, i must see, what the Engine Man says, mfg Georg :Cub5


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