|
700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
Information |
|
head gasket life?Views : 1931 Replies : 54Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Jan 18th, 2022, 09:42 | #11 |
Master Member
Last Online: May 9th, 2024 05:19
Join Date: Oct 2015
Location: watford
|
, did you retorque the head (by slackening each 1/4-1/2 turn then retorquing through entire procedure) after 600 miles when you retensioned the timing belt?
i didn't do the job but i know this wasn't done,,,,had no idea it needed to be.......... |
The Following User Says Thank You to deeman940 For This Useful Post: |
Jan 18th, 2022, 11:03 | #12 | |
Premier Member
Last Online: Yesterday 23:06
Join Date: May 2012
Location: Lakenheath
|
Quote:
Lastly was anything mentioned about retensioning the timing belt? That needs doing regardless after 600 miles. With the head bolts, if memory serves the hex head bolts are the non-stretch variety and the stretch bolts have Torx heads on them - might be wrong but failry certain that's correct.
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
|
The Following User Says Thank You to Laird Scooby For This Useful Post: |
Jan 18th, 2022, 11:47 | #13 |
Premier Member
Last Online: May 19th, 2024 20:22
Join Date: Jul 2009
Location: Holywood
|
Elring should be good quality, but at 18psi you are pushing things. With alot of duty (heat) you could be getting patches of boiling in the head with the extra heat, causing a lack of cooling. Especially if you have any pressure sealing problem in the system, or just the pressure is going beyond your caps limit. I use waterless coolant in my 360 B230FT because the cooling system design pressure is lower than than the 940s. I get hissing and bubbles in the system when using water.
I also had a small damage to the gasket probably caused by me when setting the head down. Then I have noticed that many old stock volvo gaskets are corroded, the oil in the package has attached the gasket. I've also had problems where I made a mistake and used a multiple splined socket instead of a 6 sided socket to tighen. The socket then slipped mimicing the torque wrench. Luckily I noticed the coolant weaping before I started it, and then replaced the bolts. The block or head may not have been properly cleaned or you might have deep corrosion pitting that wasn't repaired. In other words it could be anything, running 18psi and higher than stock power level you need everything to be spot on. |
The Following 3 Users Say Thank You to TonyS9 For This Useful Post: |
Jan 18th, 2022, 13:00 | #14 |
Member
Last Online: Yesterday 14:53
Join Date: Aug 2013
Location: Bristol
|
I would echo this, my one was replaced at ~150,000 miles too a few years back. It's now at 180,000 odd miles.
__________________
1996 Volvo 940 CD 2.3 LPT (His) & 2003 Volvo V70 SE D5 (Hers....until it goes wrong!) |
The Following 3 Users Say Thank You to bgarston For This Useful Post: |
Jan 18th, 2022, 13:25 | #15 |
Experienced Member
Last Online: Yesterday 23:25
Join Date: Jun 2007
Location: L/H side
|
Head gaskets on these are extremely high quality and long lived they don't just " go " You need to find out why , is it corrosion or perhaps overheated by coolant loss at some time ? In which case the head face AND often forgotten the block face need to be checked for flatness and use a new VOLVO gasket.
__________________
My comments are only based on my opinions and vast experience . |
The Following 2 Users Say Thank You to Clan For This Useful Post: |
Jan 18th, 2022, 14:29 | #16 | |
Premier Member
Last Online: Yesterday 17:48
Join Date: Jul 2012
Location: Lenzie
|
Quote:
Dave is right that the belt should be re tensioned but I've never heard of a garage calling anybody back to do that after 600 miles
__________________
V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
|
The Following 2 Users Say Thank You to griston64 For This Useful Post: |
Jan 18th, 2022, 16:48 | #17 | |
Master Member
Last Online: May 9th, 2024 05:19
Join Date: Oct 2015
Location: watford
|
Quote:
|
|
The Following User Says Thank You to deeman940 For This Useful Post: |
Jan 18th, 2022, 16:59 | #18 |
Premier Member
Last Online: Yesterday 17:48
Join Date: Jul 2012
Location: Lenzie
|
The bolt torque sequence or the re tension of timing belt ?
__________________
V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
The Following User Says Thank You to griston64 For This Useful Post: |
Jan 18th, 2022, 19:39 | #19 |
Master Member
Last Online: May 9th, 2024 05:19
Join Date: Oct 2015
Location: watford
|
|
The Following User Says Thank You to deeman940 For This Useful Post: |
Jan 18th, 2022, 21:55 | #20 |
Premier Member
Last Online: Yesterday 23:06
Join Date: May 2012
Location: Lakenheath
|
Because you didn't do the job yourself, don't know what sort of bolts were fitted. Early 940s had normal bolts that do need retorquing, later ones don't as previously mentioned. You really need to find out which you have.
As for timing belt retensioning, it's more common than you think. For example, on my other beast, there is a special blue timing mark at ~18deg ATDC and that is where you intitially set the tension. Then you turn the engine over 2 turns by hand and check everything still lines up. If so, you start the engine, let it idle until hot, switch off and allow to cool. Then turn the engine to the blue mark just after #1 TDC and release the tensioner locknut and let it retension, tighten the locknut. That's it for the next 96k miles. However on the redblock it has to be after 600 miles, timed at TDC #1, slacken the tensioner locknut and let it retension then tighten the locknut again. If memory serves that's it for 40k miles (early square toothed belt) or 50k miles (later rounded tooth belt) but the wise owner will use 36k and 48k miles respectively. As for my 760, that's never had a timing belt!
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ Last edited by Laird Scooby; Jan 18th, 2022 at 21:58. |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|