Timing Marks - '91 9000 CD 2.3L Turbo

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Mike - 26 Jan 2005 22:48 GMT

There are timing marks on the CAMS and bearing journal AND on the
spoket and keyway. Wondering which ones to use? They seem to be a one
tooth different.

Any ideas?

The one on the sprockets seems more advanced.

\ Mike Teeples /
'91 C900 SPG (124k mi.)
'87 C900 Turbo (212k mi.) RIP
'85 C900 Turbo 4-Door (275k mi.) RIP

Reply to this Message

yaofengchen@gmail.com - 27 Jan 2005 14:00 GMT

They should all match up. FYI there are more timing marks than you
described. At No. 1 piston TDC,

1. each cam sprocket has a mark and it should be at 12 o'clock,
2. each cam shaft has a mark at the first cam hold down and it should
line up with the index on the hold down,
3. the Woodruff key on the crank shaft is at 12 o'clock,
4. there is a mark on the flywheel, it should be at 12 o'clock and line
up with an index on the rear engine plate.

Of course if you do not remove the timing cover, you cannot see 3. and
if you don't remove the transmission you cannot see 4.

Reply to this Message

The Malt Hound - 27 Jan 2005 14:50 GMT

> They should all match up. FYI there are more timing marks than you
> described. At No. 1 piston TDC,
[quoted text clipped - 11 lines]
> and
> if you don't remove the transmission you cannot see 4.

If you pull off the harmonic balancer (not a trivial affair) you will
see the keyway, even with the timing cover still on.

On some transmissions (my '92 and '93 9000's w/ auto boxes for
example) there is a hole in the upper trans bellwhousing to allow you
to see a timing indicator.

-Fred W

Reply to this Message

yaofengchen@gmail.com - 27 Jan 2005 15:41 GMT

You're right about the crank pulley. More information probably than
you'll need. This is after completing my auto to 5 speed conversion on
a 94 cde. The timing sprocket has 19 teeth. The balance shaft
sprocket has 38 teeth, so are the two cam sprockets. So the crank
rotate twice as much as the cam. The flywheel has 135 teeth.

When you try to line everything up, do not be alarmed if you line up
the timing sprocket and the cam sprocket and then find the flywheel
timing mark is off by a tooth or two. Remember a timing sprocket tooth
spans about 7 teeth on the flywheel (135/19).

Reply to this Message

Richard Sutherland-Smith - 27 Jan 2005 19:16 GMT

> They should all match up. FYI there are more timing marks than you
> described. At No. 1 piston TDC,
[quoted text clipped - 8 lines]
> Of course if you do not remove the timing cover, you cannot see 3. and
> if you don't remove the transmission you cannot see 4.

AND remember that the two balance shafts rotate in opposite directions
so if the cams are a little bit out, the balance shafts are twice as
much out and in opposite directions. Took me a long time to figure this
out after altering the chain about ten times!

Signature

Richard Sutherland-Smith
19 Webb Road, Wanganui 5001,
New Zealand

Reply to this Message