‘99 S70 Wrong cylinder head?

Post by **Twarr12000** » 18 Mar 2024, 20:13

I bought a non-running S70 at auction. It has the 56 code B5254T engine (verified by engine serial number. But - it has provisions for an intake VVT. (That isn’t there) It’s my understanding the ‘99 T only had VVT on the exhaust. Has someone replaced the head at some point? It’s a California car if that makes a difference.

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Post by **Chuck W** » 18 Mar 2024, 20:19

They use the same casting for both NA and turbo heads, thus why the (unfinished) provision for the intake VVT is there. It is not open/functional.

Post by **Twarr12000** » 18 Mar 2024, 20:24

Great! Thank you!
This car is going to be an adventure

Post by **scot850** » 18 Mar 2024, 22:07

From what I have worked on the 99-00 P80 cars have a VVT solenoid on the intake only on NA engines and exhaust only on turbos.

Good luck with your new challenge!

Neil.

Post by **MoVolvos** » 19 Mar 2024, 00:33

scot850 wrote: ↑18 Mar 2024, 22:07 From what I have worked on the 99-00 P80 cars have a VVT solenoid on the intake only on NA engines and exhaust only on turbos.

Good luck with your new challenge!

Neil.

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+1. NA is on intake side only. Already stamped / cast except holes are drilled.
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Post by **abscate** » 19 Mar 2024, 05:17

Even more complicated

99 NA…no VVT
99 Turbos Exhaust VVT

2000 NA intake VVT
2000 turbos Exhaust VVT

ECUS dOnt swap, which is moot as they are pinned to VIN anyhow.

The two solenoids are unique

Definitely search by engine number as there may be a engine number break on these changes, not a VIN BREAK

On top of this , there is a transition from 7mm to 6mm valve stems as well as hydraulic to mechanical lifters in the head in 1999

Engine number is on sticker on timing belt cover, and also pin punched into the block behind the water pump area

Post by **volvolugnut** » 19 Mar 2024, 08:01

abscate wrote: ↑19 Mar 2024, 05:17 Even more complicated

99 NA…no VVT
99 Turbos Exhaust VVT

2000 NA intake VVT
2000 turbos Exhaust VVT

ECUS dOnt swap, which is moot as they are pinned to VIN anyhow.

The two solenoids are unique

Definitely search by engine number as there may be a engine number break on these changes, not a VIN BREAK

On top of this , there is a transition from 7mm to 6mm valve stems as well as hydraulic to mechanical lifters in the head in 1999

Engine number is on sticker on timing belt cover, and also pin punched into the block behind the water pump area

GREAT summary of engine valve management for 1999 and 2000. Can others add the information for 2001+ engines? When were Exhaust and Intake VVT used?

volvolugnut

Post by **foggydogg** » 19 Mar 2024, 11:33

Twarr12000 wrote: ↑18 Mar 2024, 20:13 I bought a non-running S70 at auction. It has the 56 code B5254T engine (verified by engine serial number. But - it has provisions for an intake VVT. (That isn’t there) It’s my understanding the ‘99 T only had VVT on the exhaust. Has someone replaced the head at some point? It’s a California car if that makes a difference.

Dr. Abscate has been doing a deep dive on the '99s,
viewtopic.php?t=78795&hilit=1999+bastard
Welcome to our little slice of the Volvo world. Therapy sessions are a few keystrokes away.

Post by **Twarr12000** » 22 Mar 2024, 02:37

Thanks for all the responses!
The ‘Bastards’ thread is a goldmine of information. TBH I thought the ‘99 S70 would be nearly identical to the 850’s but I’ve learned they are almost completely different. Especially frustrating is the horrible chipped key anti-theft mess. It’s a good thing the new-to-me S70 is just a ‘hobby’ car!
We previously had a 960 and it was probably the best vehicle we have owned, very powerful, extremely comfortable and handled like it was on rails. Unfortunately an errant deer put an end to it.
It’s only natural I would end up with an oddball car, I also have an ‘07 BMW X5 with 3rd row seats and 4 zone climate control which makes it a virtual unicorn. The S70 ‘bastard’ will fit right in the fleet.