RE: [DML] Re: Piston rings + sleeves

["DMC Joe" <dmcjoe@xxxxxxx>]

 Nathan,

I respectfully disagree.

In my 30 years of DeLorean consulting and servicing this is the one subject
I've had to repeat over and over.
Once again, here are the facts.

The valve train oiling problems and early camshaft failure are related to
the pre 1981 version of the PRV-6. The majority of these engines were in
Volvo 260 GLE's. It was not uncommon for these pre 81 Volvo's to start
chattering at around 40-50k miles with complete valve/cam failure at around
80-90k miles. As these failures mounted the engineers at the engine
manufacturing plant initiated a modification that enlarged the oil passages
and specified a harder camshaft. This modification completely eliminated the
earlier problems. This is one of the reasons why the DeLorean gained a
negative opinion among mechanics when the DeLorean was first introduced.

Your experience with cam chain problems is extremely rare. As a matter of
fact it is the first time I have ever heard of this problem in a DeLorean
engine. 

DMC Joe  

-----Original Message-----
From: Nathan Robinson [mailto:nathanrobinson@xxxxxxxxx] 
Sent: Monday, January 10, 2005 1:35 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Re: Piston rings + sleeves



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


Note: On different odds and ends, an interesting tid-bit is that the Ford
Triton V8 and V10 are also very similar engines to our squirrelly little
PRV-6, which was initially slated by P,R,V to be a V8, but gas shortages at
that time changed their mind. While the Triton engines have more
displacement and more cylinders and more electronics, however the guts (as
far as I can tell from visiting junkyards) look to be the same.

Also, (I don't know if this has been mentioned before) another good thing to
do if you're having problems keeping antifreeze in the system, is install
spring clamps (instead of those screw clamps) on the engine coolant tubes
right under the intake manifold. (there are two IIRC) If (when you take your
engine apart) there is antifreeze on the top of your engine block, (and it
happens to make a mess when it gets there) run to the junkyard and grab some
spring clamps off a triton engine (which just so happens to have most
everything in the same spot, and the same size, and happens to be a far more
common
engine) and it will fix the leaking antifreeze.

Also, (Boy.. i'm on a roll here) another place to get engine parts, etc...
is www.ipdusa.com and www.swedishparts.net. IPD is a tad expensive, but good
stuff, and www.swedishparts.net had dirt cheap (OEM and others) prices (and
photos) of whatever you're looking for.
Just remember the same engine (based on the research I've done on the
engine) is on a '80 - '82 Volvo 260 series car. (Different 250's I'm sure
are similar as well, but the engine production years are the same for that
particular 260 car. ('80-'85)





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