[DML] Re: PRV Timing Chain Tensioners - Oil Problems

["content22207" <brobertson@xxxxxxxxxxxx>]

PRV timing chain tensioners are loaded by engine oil (passes through
them on the way to the camshafts). If the chains wear too badly the
tensioner pistons will extend so far that oil runs past them back to
the pan, leaving the camshafts dry. This is one of the sources of "PRV
oil problems", endemic to B28 as well as B27 (timing chain tensioners
are identical).

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Nathan Robinson <nathanrobinson@xxxx>
wrote:
> 
> The PRV-6 engine had problems with oil delivery, and consequently, the
> cam chains wore like a mofo. Also, the cam chain tensioners are hard
> to check, making the engine (you guessed it) develop problems 'later
> on' in life. The blowing up bit I can only imagine is what happened to
> me.
> 
> The cam chains wore considerably and broke prematurely. A borked chain
> thrashing around at the front of the engine cover is quite a chore to
> fix. And expensive. The 'new' cam tensioners and my dad's modification
> to the front of the timing cover (and also scoring depth marks on the
> tensioners as well - so we can tell how worn the chains are) makes
> checking up on those little beasts a whole lot easier.
> 
> When those chains break, it's generally cheaper to just find another
engine.
> 
> Nathan Robinson
> 









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