valvetrain - 2.4 & 2.9

beigg · Post by **beigg** » 30 Oct 2016, 18:27

Are there any commonalities between the 2.4L and 2.9L valvetrain assemblies?
Valves, springs, seals, keepers/retainers, and anything else?

Long shot, but may be useful information to know if we have further options.

beigg · Post by **beigg** » 31 Oct 2016, 12:33

wait with bated breath, as I know some of you volvo'ers have to had this crop up as an experience in the past!

Post by **jimmy57** » 31 Oct 2016, 13:51

Yes there are common parts here. 92-99 are the same but I think 2000 changes for some pieces, obviously tappets since they went solid that year and 1999 and down are hydraulic. I didn't look up valves for 2000 but did find the same part numbers for turbo and non turbo 5's to be common to intake and exhaust valves for 6's. I don't recall whether 2000 or 2001 is the year stem diameters dropped from 6 mm to 5mm.

beigg · Post by **beigg** » 31 Oct 2016, 16:35

I'm hoping the simile of the 5.7/5.0 to 4.3 applies in like form to the valvetrain of these inlines.

Post by **jimmy57** » 31 Oct 2016, 22:04

The white motors are modular. it only makes sense to share tooling and that means share parts too. The Chevy small block was an earlier user of this but there were many others. The volvo 4 and 6 inlines from later 60's was a modular/shared architecture engine. Detroit Diesel was a big fan of this but so was CAT and Cummins.
Tappets are common to many more engines than you would think. The tappets in Olds V8 and V6 are the same as what is used is IH/Ford 6.9/7.3/6.0/6.4 diesels. Why make a hole and then have someone make tappets. Take a common tappet and then make the bores fit that tappet.

The tappets that sit on top of "buckets" in the Volvo OHC "red" motors are also used in Fiats.

Plenty more examples.

beigg · Post by **beigg** » 01 Nov 2016, 04:50

Are the valve spring rates equal per intake and exhaust for the motor?

beigg · Post by **beigg** » 02 Nov 2016, 01:24

got my hands on some keepers for both engines.
The keepers look to be exactly the same.

Post by **jimmy57** » 02 Nov 2016, 08:52

Yes, same part numbers.

beigg · Post by **beigg** » 02 Nov 2016, 09:44

The springs for the intake valves look identical. Anyone have the rates to compare them?
Might try picking apart a 2.4 next weekend to compare the spring retainers (caps) .

beigg · Post by **beigg** » 04 Nov 2016, 22:23

Springs and caps no dice.