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scottyt 08-20-2009 12:29 AM

yanmar 1 gm valve job ? with story
okay i finally found out my starting problem. a few months ago my motor started in a second or 2. for the last 2 months it took me many mins to get it to start, i started to suspect my injection pump.

well a few days ago i decided to play with the motor, and i was turning it over by hand crank with the valve cover off, i heard a hissing. so i decided that it was probably my head gasket, so i picked one and to change it out. i got it changed out but in the process the oil line to the head broke. lucky the fittings are brazed on and a a short piece of brake line later that was fixed.

tonight i went to put on the oil line, and i brought a stethoscope to listen. i found out i was loosing some compression thru the intake value.

so i pulled the head again and pulled both valves, the intake valve seat is cracked, the exhaust valve seat is eroded. the intake valve looks reusable the exhaust valve i doubt it.

has anybody ever had new seats put in and maybe new valves and what did it cost???

timebandit 08-20-2009 11:06 AM

So now you know the importance of a compression and leak down test.

Call around to a couple of auto machine shops.

It should not be much of a problem.

I would replace all the seats and valves and even a new set of valve springs and seals while you are at it.

scottyt 08-20-2009 11:37 AM

i called a local guy and his guestimate is 150 with new valves, seals, seats

i do know the value of the tests, but i never had gotten to it for money reasons, being laid off sucks.

i am a pretty good mechanic, i just dont have the tools to do this job. well i do have some but not all

flatracker 08-20-2009 08:55 PM

Sounds kind a high
Did you call a marine/Yanmar place or an automotive place to get this quote. That sounds kind a steep for a one lunger head. Friend of mine just had one done on a 2QM and if I understood him correctly, thats more than his cost at an auto machine shop. An automotive machine shop does maybe 100 times more heads than a marine dealer. And are every bit as good, if not better and most certainly a lot cheaper.

timebandit 08-21-2009 02:03 PM

I'm with flattracker, that sounds like SPECIAL MARINE PRICING to me.

You have the most important tools a mechanic needs--
hands, eyes, nose, ears and a brain to figure out what they are telling you.

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