[ROVERNET - UK] P6 interference/free running?

Netspace vmitps at netspace.net.au
Tue Dec 11 06:38:13 GMT 2007

It is interference.  They can bend valves.


----- Original Message ----- 
From: "Ron Venter" <venterrh at telus.net>
To: <rovernet at lyris.ccdata.com>
Sent: Tuesday, December 11, 2007 12:40 PM
Subject: Re: [ROVERNET - UK] P6 interference/free running?

> Nathan and Vern,
>                    You have me worried! I recently fitted a 2000 engine 
> with new 9:1 pistons. With the head off, the crankshaft rotated fully. 
> With the head on but without the timing chain connected, I could not turn 
> the crankshaft a full 360 degrees  --  almost but not quite. With the 
> timing chain on everything rotates smoothly. What have I done wrong? The 
> engine is not yet back in the car, so I don't know if it actually runs.
>                                                 Regards,
>                                                         Ron V.
> At 09:09 AM 07-12-09, you wrote:
>>  I have
>> > one question. What is
>> > the difference of a free running design and a
>> > interference design?
>>A free running or free wheeling engine has enough
>>clearance between the valves (when open) and the
>>pistons (when at Top Dead Center) that they don't
>>collide if the timing chain or belt fails and the
>>valve timing gets out of sync.
>>An interference engine can bend valves or worse if the
>>chain/belt breaks.
>>I believe the original P6 engine is free wheeling.
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