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B230 timing belt situation 700 1990

posted by  Texas745 on  Sun Sep 23 16:22 CST 2007
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last visit: Sun Jun 20 10:40 CST 2010
[RELATED]

Humbly submitted for the board's consideration,

After some reading on the BB, I suspected my cam gear might have been set one tooth ahead of its proper place on the timing belt.

I pulled back the top timing cover, and removed the plugs.
When I turned the crank to get the cam gear and crank pulley marks lined up,
I observed two puzzling things:


#1. The timing notch on the crank pulley won't land anywhere CLOSE to 0 degrees at the same time the cam gear mark lands at 11:00. (more like 180 degrees off).

#2. The position of the crank pulley when compression stops pushing past my finger in the front spark plug hole is the same as when the cam gear is at
11:00, (about 180 degrees off).

The car runs normally.

It would seem the harmonic damper has slipped. Any suggestions?







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    B230 timing belt situation 700 1990

    posted by  david hunter on  Mon Sep 24 12:54 CST 2007
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    last visit: Mon Jun 30 22:10 CST 2014
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    The crank turns twice for every one turn of the cam. Turn the crank one more full turn and the cam will go half a turn and the marks should then align.
    --
    David Hunter








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    B230 timing belt situation 700 1990

    posted by  Adirondacker on  Mon Sep 24 03:07 CST 2007
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    last visit: Mon May 12 06:34 CST 2014
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    I use a shop light to look into the spark hole while rotating rather than trusting the feel of the pressure to find TDC.

    The NA engins will run pretty well several notches off, I know from experience.

    --
    1990 745 258k Rex, 1991 745 160k Bosch, (RIP 89 745 250k)








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    B230 timing belt situation 700 1990

    posted by  aleekat on  Mon Sep 24 01:09 CST 2007
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    last visit: Fri Oct 24 13:19 CST 2014
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    "The car runs normally."
    So why do you think the belt has slipped?
    Before I would tear into the belt. Put a timing light on it. 12btdc is the mark.
    --
    Post Back. That's whats makes this forum work.








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    B230 timing belt situation 700 1990

    uid 27's pic
    posted by  Art Benstein on  Sun Sep 23 16:33 CST 2007
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    last visit: Fri Oct 17 20:10 CST 2014
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    Hi there,

    The dampers slip all the time. Best get a new one before it comes apart while running.


    --
    Art Benstein near Baltimore

    The man who fell into an upholstery machine is fully recovered.







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