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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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head gasket life?Views : 1962 Replies : 54Users Viewing This Thread : |
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Jan 19th, 2022, 10:00 | #21 |
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Retensioning
I bought my 98 940LPT in 2000 when it had done a little over 110K miles. Since then I had the timing belt replaced every 50K miles, but I never went back to the workshop for retensioning nor did I do it myself. It must now be on its 8th belt with at least the last 6 belts never having been retensioned, so I am not too worried about this recommendation.
According its service history the previous owner had the cylinder head replaced at around 100K as one of the valve shims approached the Volvo specified minimum value (running on LPG). Volvo specifies a quite generous minimum thickness and I have taken the replacement head much further now by using thinner shims without a problem. It is now nearing 430K miles, still on the second cylinder head, so the current HG is now in for 400K miles. From other owners I understand that the original HG generally lasts around 200K miles. |
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Jan 19th, 2022, 10:24 | #22 | |
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Jan 19th, 2022, 10:44 | #23 |
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I've just removed the head from my B230fk which was original on 230k
The timing belt was 18 years old with 130k on it. The plug gaps were all 0.9 and the distributor cap was cracked. Add to that the pcv was blocked solid. And it looked like the oil was about 20 years old .Funny thing is it ran like an absolute dream and idled as smooth as silk !!!
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
Jan 19th, 2022, 12:28 | #24 | |
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18psi is not big boost but I would go with 12.9 high tensile bolts or studs rather than the factory bolts |
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Jan 19th, 2022, 13:01 | #25 |
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How would average Joe know whether they have stretched or not ?
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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Jan 19th, 2022, 13:06 | #26 |
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Stretch bolts stretch so should always be renewed.
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Jan 19th, 2022, 14:53 | #27 |
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There is a narrower section half way down the bolt , if it looks waisted change it . I have not yet seen one which is , Maybe overtightening will do that. The manual says use the bolts a maximum of 5 times .
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Jan 19th, 2022, 17:27 | #28 | |
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A bit off topic...
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You have reached the minimum shim thickness when the shim no longer sticks out of the bucket, around 3.0 to 2.9 mm thickness. f you go beyond you risk damaging the camshaft as the cams will then hit the top rim of the bucket. Obviously taking the max out of a cylinder head was not anticipated by Volvo and I can imagine that they took a much bigger margin. I do not think there is a risk of thinner shims flipping out of the bucket, as the (considerable) force needed to pry them out of the bucket does not depend on thickness. |
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Jan 19th, 2022, 18:13 | #29 | |
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Jan 19th, 2022, 18:27 | #30 |
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According to parts catalogue all 940's from 1990 to 1998 used the same stretch head bolts. Part number 1306341
And suggest one use only https://www.skandix.de/en/search/?q=1306341
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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