I recently purchased a well cared for '84 300D with 171K from an attorney and
yesterday went to the MB dealer to pick up an oil filter and fuel filter. While
there, I asked the service manager how much they charged to adjust valves and he
responded that they do not work on that old of a diesel, which surprised me. He
said the older diesels are too much different than the new ones. He then told
me not to worry about adjusting valves unless they rattled. I had heard
somewhere that the valves should rountinely be adjusted as preventative
maintenance. Who is right??
That should be your last trip into that dealership. I have an '82 300D. You
got a very good car. Adjust the valves every fifteen thousand miles. But I
don't. I have them adjusted every fall, September or October, just before
cool weather. I can't say "cold weather" because I'm in central Florida.
Properly adjusted valves make it easier to start and keeps the fuel mileage
In the back yard, under the oak.
Well, there is probably some truth to what he says. Speaking only from
personal experience. I bought a 240D with 85k km on it and drove it till
about 220k km when it needed a waterpump. The dealer asked if it ever had
the valves adjust - I said no..... didn't realize it had to be done. He
checked/adjusted the valves at this time and found that they were 'pretty'
good just the way they were - maybe a little tight. So, take it from there
I drove it fairly hard ... :-) not all that different from an old Beetle
which probably doesn't mean a lot considering how underpowered it is. Floor
the Gas while popping the clutch (mind you I did need a new clutch). In any
case, valves seemed to be just fine after driving it for 135k km and I doubt
the lady who had it before me did anything to it either. BTW I sold it to
a guy driving Taxi and he put another 150k km on it - hard service I'd say
and he lost the car because someone rammed it finally. I'd also say,
wait till it makes some noise.
This guy doesn't know what he's talking about - typical dealer salesman
- service advisor.
Out of adjustment valves never "rattle" that's because they're too
tight, not too loose. The point of adjusting valves it to restore the
safety gap that ensures that the valve will fully close.
Either find an independent M-B shop or learn to DIY every 15K to 20K
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