1999 S70 One of these head bolts is not like the others.

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

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Brucebo
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1999 S70 One of these head bolts is not like the others.

Post by Brucebo »

By the way, who is the recommended shop nowadays for rebuilding your Volvo head?
Broken head bolt
Broken head bolt

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E Showell
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Post by E Showell »

Been there, done that. Easy out is your best friend after finding a good, sharp reverse handed drill bit.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT

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erikv11  
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Post by erikv11 »

Ugh. Sorry to see that.

Check this out regarding rebuilt heads: https://www.matthewsvolvosite.com/forums ... =1&t=69336
'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
'07 XC70, 170k
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k

Brucebo
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Post by Brucebo »

Scuttlebutt on the web is, once the top of the bolt is broken off, tension is removed from the threads, so it should not be too difficult to remove the stub with a reverse drill and/or an Easyout. I currently have the hole filled with Liquid Wrench. I also put an exact diameter transfer punch down in the hole and tapped it with a hammer to put an exactly centered starter hole on top of the stub for the drill. I also plan to put a steel bushing in the well to keep the drill bit centered and protect the sides of well.

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E Showell
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Post by E Showell »

Transfer punch and bushing both good ideas, but I am here to tell you that a good, sharp reverse threaded drill bit will be your best friend. A good cut followed by an easy out of the proper size and you'll be good to go. Just move deliberately and carefully and you should be fine.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT

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E Showell
Posts: 3216
Joined: Thu Oct 16, 2008 4:00 pm
Year and Model: V70R '06 AWD Auto
Location: Long Valley, N.J.
Has thanked: 35 times
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Post by E Showell »

Let me guess. Back side of engine, i.e., adjacent to firewall, between cylinders 2 and 3 or 3 and 4?
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT

Brucebo
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Year and Model: 850 '96, S70 '99
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Post by Brucebo »

Let me guess. Back side of engine, i.e., adjacent to firewall, between cylinders 2 and 3 or 3 and 4?
Exactly! Must be not too uncommon.

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abscate
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Post by abscate »

Anything one can do here to prevent this nasty? Maybe getting penetrant down the threads before loosening?
Empty Nester
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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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Link To Volvo Glossary

Brucebo
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Post by Brucebo »

abscate wrote:Anything one can do here to prevent this nasty? Maybe getting penetrant down the threads before loosening?
How would one do that? Before loosening, the bolt head flange is tight against the top of cylinder head. No way to get to the threads. I suppose someone could design a head bolt with a small cylindrical hollow center shaft to serve as a temporary oil galley, with small radial galleys going out to the threads. To be filled with PB Blaster prior to removal.

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abscate
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Post by abscate »

You can get penetrating oil to tight threads with...

Time
heat
Reasonable application of shock - rattling the bolt with careful taps
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

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