Amazon Cyber Monday 2020
IPD sale XeMODeX - Experts in Volvo Electronics

Get email notification of topic replies. Log in or register (free). Amazon Link Buy anything with this and it helps MVS!

Re-Torque Head Bolts that were too loose?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Post Reply
Dmck
Posts: 60
Joined: Fri Jun 29, 2018 1:41 am
Year and Model: 1995 850
Location: Austin, TX
Has thanked: 1 time
Been thanked: 2 times

Re-Torque Head Bolts that were too loose?

Post by Dmck »

So after doing research I have realized I did not torque my head bolts down correctly on an 95 850 turbo sedan.

I only did the final 130degree sequence (in three stages) and not the 15 and 44 ftlb sequences.

The only time I get burned coolant coming out of exhaust is when my radiator fan turns on. I'm guessing this means my coolant temp must need to get to boiling before it seeps into cylinders. The car has been driven around for a week.

There is no issue with coolant in my oil, or oil in my coolant, or pressure build up in my coolant tank, so I believe the rest of the head gasket is sealed and only the metal rings on the head gasket around the cylinders are compromised.

I know the proper thing is to just do complete head gasket redo, and possibly need to machine flatten the head again, but I want to gamble and try to re torque the bolts.

If you were as dumb as me and wanted to try to take the easy way out, would you:

A) just torque all head bolts down around 15 more degrees (or some other amount)

Or

B) loosen all head bolts and retorque them all to proper spec.

I understand neither of these are correct and I should just do full head gasket job. This is my personal vehicle, so me doing something stupid will only hurt me.
User avatar
abscate
MVS Moderator
Posts: 23237
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 414 times
Been thanked: 1271 times

Re: Re-Torque Head Bolts that were too loose?

Post by abscate »

Once you get to them, just use the correct sequence again, after loosening them in proper sequence.
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
User avatar
erikv11
Posts: 10045
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
Location: Iowa
Has thanked: 124 times
Been thanked: 348 times

Re: Re-Torque Head Bolts that were too loose?

Post by erikv11 »

What abscate said, I would probably do the same.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 293k
'06 S60 R, 167k
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
User avatar
mrbrian200
Posts: 1552
Joined: Wed Jan 20, 2016 8:47 am
Year and Model: 2006 S60 2.5T FWD
Location: Northern Indiana/Chicago
Has thanked: 7 times
Been thanked: 80 times

Re: Re-Torque Head Bolts that were too loose?

Post by mrbrian200 »

Consensus: loosen and re torque the bolts properly by the proper sequences. Do it sooner rather than later: fluid and hot exhaust gasses seeping past the gasket can etch the gasket or cause the layers of this multi-layer steel gasket to separate at which point you will have no other choice than to replace the gasket..again.
If after retorquing it doesn't want to seal then one or both of those conditions has already occurred.
j-dawg
Posts: 1130
Joined: Sat Apr 20, 2013 10:56 am
Year and Model: 1999 V70 T5
Location: Los Angeles, CA
Has thanked: 3 times
Been thanked: 27 times

Re: Re-Torque Head Bolts that were too loose?

Post by j-dawg »

Seems to me if you're already going in there you might as well replace the gasket. It'll be minimal extra work, and you'll know the gasket in there is good, whereas if you just retorque you have no idea what that thing's been through.
1999 V70 T5 5-SPD | ~270k mi | burns more oil than gasoline
User avatar
erikv11
Posts: 10045
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
Location: Iowa
Has thanked: 124 times
Been thanked: 348 times

Re: Re-Torque Head Bolts that were too loose?

Post by erikv11 »

The "no idea ...: statement is fair enough. However I would consider pulling the head to be much more work than just re-tightening the head bolts, the "already going in there" statement is not so relevant. Cleaning the surfaces to install a new HG is not a small job, there is puling the manifolds, the expense of a new HG and manifold gaskets, etc. Look at it this way, OP will be really good at the first part of head removal if tightening doesn't solve it. :)
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 293k
'06 S60 R, 167k
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
User avatar
FLXC90
Posts: 1084
Joined: Mon Aug 18, 2014 4:31 pm
Year and Model: 98 V70 T5
Location: Florida Panhandle
Has thanked: 9 times
Been thanked: 38 times

Re: Re-Torque Head Bolts that were too loose?

Post by FLXC90 »

I agree with the "while you're in there" point of view. If OP can get a helper to lift the head straight up and steady it, I doubt the cleanup would be much with so new a gasket. beats the expense of a third redo. With a helper they might be able to leave the intake on as a handle. After removing the brace bolt of course!
Current Volvos:
1998 V70 T5, 112k sat 5 years, still in mechanical coma (finally at the top of the pile )
2004 XC90 T6 AWD: 186k, 60 on transaxle ( traded in )
1998 POS70 N/A: DD/training aid, 236k but really about 240k, I think...ABS module( passed on to son who sold it)
Post Reply
  • Similar Topics
    Replies
    Views
    Last post