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Old 03-30-2018, 09:42 PM   #1
1rockhead
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Default Quick timing question

I just finished my first timing belt change. It started right up. Seemed to stumble a little bit on acceleration. I only let it run for 30 seconds or so due to the acc belts not hooked up. The crank timing mark was a hair off when i reassembled. Do you think i should redo it or will the computer compensate?
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Old 03-30-2018, 09:42 PM   #2
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Oh 1990 volvo 240
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Old 03-30-2018, 10:53 PM   #3
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Can't you just check if the timing marks line up? you may need to spin the engine a bit to re-line up the marks on the belt with the gears, or you could count the teeth.

One tooth off is what, 14 degrees? you'd definitely be able to tell it isn't running right if that were the cause.
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Old 03-30-2018, 10:57 PM   #4
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it likely wouldn't run at all if you were a tooth off on the crank.

check the timing with a timing light.
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Old 03-31-2018, 03:58 AM   #5
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Quote:
will the computer compensate?
Nope.

Quote:
it likely wouldn't run at all if you were a tooth off on the crank.
Sure, it would still run (maybe), but just barely.

The best way to check is to take both covers off and check all the marks, but if you're sure the outer ring hasn't slipped on the hub, you can use the marks on the balancer's pulley and the lower cover to put the crank at TDC. Then check the marks on the big shiny sprockets in the following link. On my car (head mounted distributor), only the top and bottom pulleys matter, but on yours (block mounted "normal" distributor), all 3 need to be correct.

Pics linked from:
http://www.threefattigers.com/Protoc...imingMarks.htm

Cam:



Auxiliary shaft (drives your distributor):



Crank:



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Old 03-31-2018, 02:32 PM   #6
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That last picture really helped. Checked again and all timing marks were lined up at it is running great. One question still, is it normal that the lines on the belt no longer line up to the Timing marks on the sprockets?
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Old 03-31-2018, 02:45 PM   #7
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Quote:
Originally Posted by 1rockhead View Post
That last picture really helped. Checked again and all timing marks were lined up at it is running great. One question still, is it normal that the lines on the belt no longer line up to the Timing marks on the sprockets?
yes
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Old 03-31-2018, 02:54 PM   #8
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Quote:
Originally Posted by 1rockhead View Post
That last picture really helped. Checked again and all timing marks were lined up at it is running great. One question still, is it normal that the lines on the belt no longer line up to the Timing marks on the sprockets?
Turn the engine 5000 times by hand and they will line back up.
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Old 03-31-2018, 04:58 PM   #9
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Great. Thanks for the help
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Old 05-12-2018, 11:58 PM   #10
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So everything was fine... Went to start it tonight and wouldn't fire up. Sounds the same as before. Assuming I did the Timing belt right is there something else that can cause the tbelt to slip?
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Old 05-12-2018, 11:59 PM   #11
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I have put maybe 100 miles on it.
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Old 05-13-2018, 12:02 AM   #12
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Oh and i replaced the tensioner also
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Old 05-13-2018, 07:29 AM   #13
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When you put the belt on, you need to turn the engine over by hand at least one full cam revolution and then retension the belt.
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Old 05-13-2018, 10:21 AM   #14
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I retensioned after a few test drives.
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Old 05-13-2018, 12:03 PM   #15
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Thinking the cam may be binding a bit. Tried turning the engine over at crank and the cam would not turn until I put a wrench on that also. Once i turned it one revolution it turned fine by the crank bolt only. If the cam is seizing does that mean I need a new head?
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Old 05-13-2018, 03:03 PM   #16
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Camshaft looks fine. Bearing caps seem fine. The new belt did have at least one missing tooth.
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Old 05-13-2018, 09:27 PM   #17
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Intermediate shaft spins freely. There was a small amount of belt remnants on the tensioner pulley but it still spins freely. Any ideas?

Last edited by 1rockhead; 05-13-2018 at 09:49 PM..
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Old 05-14-2018, 02:50 AM   #18
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Quote:
Originally Posted by 1rockhead View Post
Camshaft looks fine. Bearing caps seem fine. The new belt did have at least one missing tooth.


A) replace with new belt

B) also I would follow VB242 advice and retension belt in that manner
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Old 05-14-2018, 09:12 PM   #19
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Quote:
Originally Posted by 1rockhead View Post
the cam would not turn until I put a wrench on that also.

The new belt did have at least one missing tooth.

There was a small amount of belt remnants on the tensioner pulley but it still spins freely.
Can I assume you used the proper belt?

Yours should have the "square" teeth to match your 1990.
In 1993 they went to a "round" tooth style (as seen in the above pics).
Not compatible unless you also change all the sprockets.

I also assume you didn't over/under-tension the belt?
The normal procedure (how I do it) is to remove the rubber plug in the belt cover, loosen the tensioner nut with a socket (1/2 turn or so), turn the crank slightly clockwise to pull the non-tensioner side of the belt tighter, (and allow the tensioner's spring to take up any slack), then retighten the nut to 37 ft-lbs.

Here's a crank sprocket comparison, borrowed from another post:
http://www.forums.turbobricks.com/sh...d.php?t=198536


Last edited by MasterBlaster; 05-15-2018 at 12:27 AM.. Reason: Google Drive sucks. Tinypic to the rescue.
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