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1996 850 interference

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, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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dondiano
Posts: 1
Joined: 21 Jan 2014, 15:12
Year and Model: 850 1996
Location: Pennsylvania

1996 850 interference

Post by dondiano »

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

jimmy57
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Post by jimmy57 »

Yes, readily.

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misha
Posts: 4930
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Year and Model: '97 850 2.5 20v
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Post by misha »

20v (B5254 & B5204) are interference ...but i heard that 10 valves engines are not.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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FCPEURO
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Post by FCPEURO »

That is correct. The 4-Cylinder, 8 valve and the 5-cylinder, 10 valve are non-interference.
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erikv11
Posts: 10980
Joined: 25 Jul 2009, 14:03
Year and Model: 850, V70, S60R, XC70
Location: Iowa
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Post by erikv11 »

To the original poster: the US spec cars are 20 valve. All of those 5 cylinders are interference engines.
'95 854 T-5R, Motronic 4.4, 185k
'96 855 NA, 147k
'98 V70, T5 tune-injectors-turbo, LPT engine, 294k
'06 S60 R, 172k
'07 XC70, 189k
'99 Camry V6 :shock: 138k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k

jimmy57
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Location: Ponder Texas
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Post by jimmy57 »

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

precopster
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Post by precopster »

I've worked on the 10 valve (B5252S) 5 cylinder engines and they're interference motors; flycuts on pistons means that's the case.
Current cars:2002 XC70, 2006 Ssangyong Rodius (Stavic), 2006 XC90 2.5T, VW Transporter 2.5TDI

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RJYC
Posts: 2
Joined: 12 Jan 2020, 21:11
Year and Model: '95 Volvo 850
Location: Manila

Post by RJYC »

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?

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misha
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Year and Model: '97 850 2.5 20v
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Post by misha »

Nope...engine management is totally different.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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Clemens
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Joined: 03 Sep 2015, 12:34
Year and Model: 96 855 R + 94 855 T5
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Post by Clemens »

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.
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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