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Timing belt change botched. Car's driving better. Some questions. 700 1989

posted by  lucast on  Sun Jun 29 11:09 CST 2008
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last visit: Sat Sep 24 00:38 CST 2011
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I just redid all the belts and front seals on the 740T.

I have few questions that I hope you can help me answer.

1. How the heck does one get the timing belt on with all the timing marks perfect?

I have read the FAQ and whilst Mike Ponte's step by step is excellent, it doesn't seem to give the vital tips, in a sense (pardon me Mike). Does one actually wrap the belt so that the double white lines (crank) fits perfect with the mark on the crank pulley, and then align the nearest single white line with the intermediate drive pulley mark, and then the camshaft pulley? Despite my thinking that I have done this properly, without moving either the crank or cam pulley, the belt just won't slip on. Any tips here?

It's like, if the marks appear to line up, the belt just won't go on because some tooth on the belt is just out, or there's some slack in the wrong place like between the crank and intermediate pulleys.

In desperation, I turned the cam pulley a little counterclockwise with a wrench to move the teeth on one pulley a little in order to get the belt to slip on. After a couple of goes, I had to quit with the cam advanced (counterclockwise) by a couple of teeth - my back's been killing me. If the cam timing mark is spot on, the crank pulley mark reads exactly at position "10" on the little 2/0/10 scale on the lower timing belt cover.

I was thinking that the car would really drive crap with cam timing out, but on the contrary, it seems to have better acceleration from a standing start and the transmission seems smoother! All in all, an improved drive from a botched timing belt operation.

2. Is the steering on the 740 generally fairly heavy or is my steering pump about to go?

It seems of late that the car needs to be fairly warmed up before the steering becomes lighter - I am sure I am not imagining this, but the steering quite definitely was lighter in the past. I drive an 850 as a regular car and the 740's steering feels rather heavy by comparison, especially from a cold start. The heavy steering is good for straight line highway cruising if I may say.


3. How tight must the accessory belts be?

I basically screwed all the long and thin tension adjustment bolts for the PS pump, the alternator, and the aircon compressor so that the belts are as tight 'as sensible'. Is there a recommended tightness and how does one 'measure' it?


Thanks
Regards

Lucast








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    Timing belt change botched. Car's driving better. Some questions. 700 1989

    posted by  TONY H on  Mon Jun 30 08:40 CST 2008
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    last visit: Fri Oct 17 16:39 CST 2014
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    To answer Question number 1: NO

    What you can do is look at your Crank gear, count back 4 teeth and make a mark with Whiteout. Then take you belt count back the same amount from the double white line. Now when you put it on the marked gear is on a touching surface of the belt and you can make sure it is aligned.

    Kinda silly that they mark it yet the Crank gear mark is floating out away from the belt.

    --
    '75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.no.net/ebrox/Tony's%20cars.htm








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    Timing belt change botched. Car's driving better. Some questions. 700 1989

    posted by  SpazMan on  Sun Jun 29 11:25 CST 2008
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    last visit: Tue Aug 14 21:06 CST 2012
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    Be sure the 12mm and/or 13mm bolts that hold the accessories are tight. The 10mm adjusters will break from the strain if they hold the accessory alone.

    I was first-timer with a timing belt a couple months ago. I had the same trouble you had - I would end up having the belt on with the timing out. But I found that I could 'squeeze' the belt onto the cam and crank gears, then stretch the belt to go over the intermediate shaft (which moved easily, so I could get it on). After a few tries, and a 3rd-degree sunburn, I got it on.

    I at least think that's how I did it. After being out there 6 hours in the sun, I was a little ill.

    Ari







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