Timing belt broke, head replacement?

melmaclifeform · Post by **melmaclifeform** » Fri Jan 24, 2020 5:27 am

Awesome!

As for making sure I have the right tutorial, I can be pretty certain that the tutorial from RobertDIY is adequate for my '99, correct? I know whiteblocks are similar so there are plenty of guides to go off of, but I would like to be certain.

Post by **abscate** » Fri Jan 24, 2020 6:41 am

melmaclifeform wrote: ↑Fri Jan 24, 2020 5:27 am Awesome!

As for making sure I have the right tutorial, I can be pretty certain that the tutorial from RobertDIY is adequate for my '99, correct? I know whiteblocks are similar so there are plenty of guides to go off of, but I would like to be certain.

I believe the 1999 is a hybrid

Solid cams, no VVT

Mechanical tensioner, not hydraulic like the -1998

So, that tutorial might not pick up on all the 1999 changes.

There is a thread on the 1999 changes in the 'Major Forum Topics' Sticky up top,

Sean in Boston was recently into his 1999 S70 NA for a head gasket - Ill link to his thread.

My favourite young guy is in Charlotte too, and despite his failings of youth Im sure he is one to mix up in with on Volvos.

(whew - almost dangled three prepositions)

melmaclifeform · Post by **melmaclifeform** » Fri Jan 24, 2020 6:50 am

A link to that thread would be great!

Post by **abscate** » Fri Jan 24, 2020 7:11 am

viewtopic.php?f=1&t=91809&hilit=1999+S70+head+gasket

melmaclifeform · Post by **melmaclifeform** » Sat Jan 25, 2020 5:10 pm

SuperHerman wrote: ↑Thu Jan 23, 2020 7:12 pm
You can source new valves for those bent or buy used ones. Pull the part number and see what other engines use it for used. The head is married to the cam cover - so don't go swapping.

What does it mean it's married to the cam cover? Wouldn't it be able to be swapped if it could be taken off? Or is that just an extra four hours of work?

Post by **SuperHerman** » Sat Jan 25, 2020 6:40 pm

No they are married meaning they are machined as a unit. The head and cam cover are to be viewed as one piece.

Post by **volvolugnut** » Sat Jan 25, 2020 6:46 pm

What this means is Volvo factory selected a head and cam cover without the cam bearing bores, glued and bolted them together, and bored the cam bearing holes on both head and cam cover at the same time. This assured perfect alignment of head and cover cam bearings. Another cam cover will not have the cam bearings aligned for top and bottom surfaces.
This machining method assures great accuracy without the problems of using alignment pins while allowing the two surfaces to be separated for service.
volvolugnut

Volvo Forum + help for owners

Timing belt broke, head replacement?

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