Thanks,
Alan
85 300 turbo
LarryT wrote:
It's been 10+ years since I was deep into my 240D engine, but IIRC, turning
it backwards can also cause the old style (the ones with the clip) chain
connectors to come apart. But I believe the primary reason is the chain
jumping a tooth. While it may seem unlikely, it's actually pretty easy if
the chain is stretched or a tooth is damaged.
Again, this is from memory going back to '95 - but, the timing device on the
end of the IP that is turned by the TC has a fairly tight fit between the
chain and block - turning the engine backwards can cause the chain to bunch
up & jam in the tight confines if the slack Jim C mentioned is not taken up
carefully. A link can move to the next tooth without the "technician"
realizing it.
The above was observed while working on my 78 240D (W123) and it may not
apply to other engines.
Larry T (67 MGB, 74 911, 78 240D, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
Test Results http://members.rennlist.com/oil
PORSCHE POSTERS! youroil.net
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.
----- Original Message -----
From: "Alan Clarke" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Monday, November 06, 2006 12:55 AM
Subject: Re: [MBZ] 1979 240D Time Chain Stretch
I'll bite, what's the harm in turning the engine in the wrong direction...
Thanks,
Alan Clarke
85 300 Turbo
LarryT wrote:
Hi Tom,
As the engine rotates - and it must *only* be turned in the normal
direction of travel, BTW - you'll see the cam lobes turn and alternately
open/close the valves. When both of the high parts of the cam over #1
are
pointing more or less up, it'll be on TDC - but the scale on the crank is
the final authority. Once close, you should be looking to get the mark
on
the cam aligned with the notch in the cam tower closest to the radiator.
But, even if you miss the spot by just a little don't be tempted to turn
the
engine backwards to the mark - just crank the engine over again and watch
the cam until the mark is close. It can be frustrating as often the
compression will not allow the engine to stop at the proper point. Just
be
patient.
Once you've done it once it will seem very easy.
Good luck -
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