1996 850 interference

dondiano · Post by **dondiano** » 21 Jan 2014, 15:20

Is the Volvo 5 cylinder engine an "interference" engine, meaning that the valves and pistons will collide if the timing belt breaks? Thanks!

Post by **jimmy57** » 21 Jan 2014, 15:21

Yes, readily.

Post by **misha** » 21 Jan 2014, 15:34

20v (B5254 & B5204) are interference ...but i heard that 10 valves engines are not.

FCPEURO · Post by **FCPEURO** » 21 Jan 2014, 16:05

That is correct. The 4-Cylinder, 8 valve and the 5-cylinder, 10 valve are non-interference.

Post by **erikv11** » 21 Jan 2014, 20:26

To the original poster: the US spec cars are 20 valve. All of those 5 cylinders are interference engines.

Post by **jimmy57** » 21 Jan 2014, 20:38

I see Pennsylvania in his profile (thank you very much for putting that in) and already weeded out non US-spec engine choices.

Post by **precopster** » 04 Feb 2014, 15:56

I've worked on the 10 valve (B5252S) 5 cylinder engines and they're interference motors; flycuts on pistons means that's the case.

RJYC · Post by **RJYC** » 12 Jan 2020, 21:57

My 850 which engine code of B5252S /401856 stamped on the block has a 10 valves on it, is it possible to upgrade into 20 valves (B5254S) cylinder head and upgrade also the Piston heads for 20 valves?

Post by **misha** » 13 Jan 2020, 06:10

Nope...engine management is totally different.

Post by **Clemens** » 13 Jan 2020, 06:41

it is also not possible to swap a turbo-motor into a non-turbo-body. on p80 Volvos what you get is what you've got, no easy way to change that.