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Interference engines

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Old Sep 23rd, 2017, 13:48   #1
Derek UK
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Default Interference engines

The subject if which engines are interference and which are not pops up now and then but wanting to get all of the info in one spot I'd like to ask which is which and whether the same engines in different markets are different. I have the 2l engine in my '92 SE and I believe that is interference but what about the various models of the 2.1l and 2.3l. Lists on line do contradict each other even those of timing belt companies.

Yes I have read of broken belts changed at the side of the road and the trip completed with just an hour lost but you can only do this if it's a non interference engine.
Comprehensive list wanted please.
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Old Sep 23rd, 2017, 14:52   #2
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Plenty of warmish discussions on the 700/900 forum on this subject over many years - I know what (UK market) engines are non-interference - including mine - that's all that concerns me.

Jon

Last edited by CTCNetwork; Feb 24th, 2018 at 13:45. Reason: One more time....
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Old Sep 23rd, 2017, 15:09   #3
classicswede
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The only engines that spring to mind as a problem are the B19 series and the B230K engines.
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Old Sep 23rd, 2017, 15:20   #4
Stephen Edwin
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Derek you have a seriously good question. I think you want a specific and as near as possible definitive list. I suspect a lot of 240 (and lesser variant) Volvos would like that best available information in one place.
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Old Sep 23rd, 2017, 18:22   #5
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4-Valve (i.e. twin-cam) units are interference; otherwise B21 and B23 are non-interference, B200 and B230 except K-suffixed examples are supposedly non-interference. The K-suffixed units have a different combustion chamber to the rest of the 2-valve motors.

As remarked elsewhere on this thread, there are differing opinions on the subject but I know from experience that B21As are non-interference.
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Old Sep 23rd, 2017, 19:37   #6
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The problem with this issue/thread is that every poster thinks their view is the correct one.

Jon.
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Old Sep 24th, 2017, 07:16   #7
Clifford Pope
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There is only one safe way of knowing that an engine is non-interference and that is by removing the timing belt, eg when changing it, turning the cam shaft to a position where several valves are fully open, removing the spark plugs, and very cautiously turning the crankshaft by hand to see whether a piston touches a valve.

It would be really useful if there was a list somewhere of each engine type with members' reports of successful trials.
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Old Sep 24th, 2017, 13:18   #8
Bugjam1999
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Bear in mind that an originally non interference engine may become an interference engine if the head has been skimmed at some point...

Cheers
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Old Oct 10th, 2017, 16:14   #9
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In my 740 I have the B230K - 2.3 redblock.

Interference apparently.
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