RE: [DML] Re: PRV Oil/Camshaft Problems

["Sean Manning" <sean@xxxxxxxxxxxxxxx>]

There seems to be another one according to Alldata:

http://www.alldata.com/TSB/64/82641119.html


Bulletins for 1982 Volvo 260 V6-2849cc 2.8L SOHC B28F

TSB Number   Issue Date  TSB Title
21105          OCT 84       Engine - Camshaft/Rocker Arm Wear

Do you have the text for that TSB?  Thanks.

Sean


-----Original Message-----
From: content22207 [mailto:brobertson@xxxxxxxxxxxx] 
Sent: Tuesday, January 11, 2005 8:30 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Re: PRV Oil/Camshaft Problems




I respectfully disagree with your disagreement:

- I have two notebooks of Volvo B27-B28 factory literature spanning
1979-1985, none of which contains a single word about modified oil
passages or different camshaft materials.
- The only Volvo TSB dealing with PRV camshaft wear (#21112 4/84)
addresses the problem in terms lighter oil viscosity specification,
retroactive to the beginning of engine use, not enlarging oil passages
or replacing early camshafts with later models.
- The oil passage/camshaft rumor periodically rears it head in BBS's
such as swedishbricks.com and brickboard.com, only to be discredited
by Volvo owners themselves. Note that some of these owners have
enlarged oil return passages of their own volition (others claim that
lighter oil alone solves the problem).

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "DMC Joe" <dmcjoe@xxxx> wrote:
> 
>  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@xxxx] 
> 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)
> 
> 
> 
> 
> 
> To address comments privately to the moderating team, please address:
> moderators@xxxx
> 
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www.dmcnews.com
> 
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