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#1
05-17-2007, 12:17 PM
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Bad valve adjustment on 240D 4 spd
I adjusted my valves yesterday morning at 11 a.m. , 3 hours after I had driven it for about 5 minutes. I'm going to guess that even though the engine temp. did'nt break 100*F while driving, the engine was'nt cool enough for a good adjustment. The car could'nt go past 60mph because the engine was reving too high for me to push it any harder. This car can usually do 75mph comfortably.
Adjusted valves again this morning and the car is performing better on the highway, but the rpm's are still too high for the speeds that it's driving at. I've successfully adjusted the valves in the past, and I'm using the same feeler gauges as before. Does it sound like the valves are too tight or too loose? Thanks, Otto 
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#2
05-17-2007, 12:36 PM
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on a manual trans. the only thing that links RPM to the road is the clutch.
if the RPM's are too high, your clutch is slipping. John
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
05-17-2007, 05:31 PM
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Thanks John,
I'm pretty sure it's not the clutch. I replaced it a year ago. When I'm in 3rd gear driving 30 mph, the engine feels like it did when running at 40 mph before the valve adjustment. I was driving down a hill today at 60 mph and the engine was reving too high, so I coasted in neutral for a short distance, then popped it back into 4th. The engine raced, and the car slowed down as if I had put it into 3rd gear. I'll try again tomorrow, and hope I have'nt ruined anything.
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#4
05-17-2007, 06:08 PM
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Hey Otto,
There is absolutly NO way that changing your valve adjustment will affect your cruise RPM. The engine may be louder due to more clearance in the valve train leading you to think its turning faster, but it will be turning the same rpm in the same gear at the same speed that it always was. If the engine really is turning faster, it is due to some completly unrelated problem, and with a manual trans the only place slippage is possible is the clutch. Cheers, Chris
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