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Hello, I need to adjust the valves on my 09 Mitsubishi Eclipse GT. I know how to do it but the service manual says to do it on a hot engine. By time I remove all the stuff I need to move in order to get to the valve covers the engine won’t be hot. Warm maybe? They only list specs for hot engine,not warm,not cold,etc. Any idea? Thanks in advance!!
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see if this helps. 11b page 22
http://tearstone.com/eclipsefsm/2006_PS24S_MMNA_SM_PDF/GR00004800-11B.pdf
Its a 3.8 V6, not a 4. I do have that manual for my engine. That’s where I got the info I listed above (I think anyway). It was a while ago. Thanks for your effort!
It’s a somewhat hard question to answer. All I can suggest is to remove everything you can and still run the engine to keep it warm and work quickly from there.
That was my thought too….go really fast! I’ve never done the adjustment on this car or a car that’s similar so it will be a challenge. Thanks for nothing, lol, just kidding!
Honestly if you don’t’ have any valve train noise I would leave it be. If you’re not practiced at valve adjustments you can really screw up your engine. Therefore, if you don’t need a valve adjustment, I would leave it alone.
As to your original question, most valves are adjusted when the engine is at operating temperature because the metal will expand as it warms up, thus changing the clearances between the metal parts. If you were to do your measurements on a cold engine the tolerances may be looser than they are at operating temperature. They want you to perform the adjustment when the engine parts have fully expanded so that the tolerances are correct when the engine is warm and running at operating temp.
Good luck and keep us posted.
Not only what Eric said, but they also figure in tear down time when designing the adjustment specifications. What they normally mean by operating temperature is that if you shut the vehicle off and remove what is needed to adjust valves you are still well within spec.
Correction (the exhaust has no adjustment, I thought the intake did not either I was wrong)
You adjust them COLD not hot.
Interesting…every manual I’ve seen shows this or something similar.
VALVE CLEARANCE CHECK AND ADJUSTMENT
M1111001500409
1.Before checks, check that the engine oil, starter and battery are normal. Also, set the vehicle in the following condition:
•Engine coolant temperature: 80 − 95°C (176 − 203°F)Thanks!
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