[DMCForum] Vacuum leaks

["content22207" <brobertson@xxxxxxxxxxxx>]

You'll never find them all...

Trust me. Have been chasing them all over mine for a year. Engine will
run alright -- just won't idle smooth as silk (until you hit leak with
spray solvent of some sort). Started at upper air assembly and am
working my way down. To date: U pipes, cold start tube, intake to
heads, injector seals, and valve covers. Latest find is crank seal in
timing chain cover.

Buy stock in the company that makes that orange silicone -- I'll make
you a rich man.

You might as well know now: you have just gone to a lot of trouble to
resurrect a very odd piece of hardware. PRV cut from totally different
bolt of cloth. Is no accident Ford Motor Company didn't snap them up
for its own use. Is certainly functional. Makes a distinctive sound
that may be integral to DeLo driving experience. Is even fairly peppy.
But is 1,000 times more difficult than a 460 (carbureted, please).

Devotees love to claim various advantages of PRV. IMHO biggest single
reason DMC used: it was there (already in Europe, where car was being
built). Doesn't appear to have made much of an impression on anyone
other than the French, so perhaps JZD got better deal than alternative
blocks. Is really too bad he didn't build a factory in Dearborn Michigan.

Have fun driving new toy around the parking lot.

BTW: are you running off gasoline yet? Maybe you could run a hose into
passenger compartment to keep spraying starting fluid (just kidding.
Wouldn't you be a sight on Rt 50).

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> I don't think anything is stuck. Like I said, as soon as it had oil 
> it fired right up. I agree with the friction part. I think that's 
> what lagged it out.
> 
> As soon as it had the micro-layer, watch out...
> 
> I've already leaned out the co screw. It's much better. I also 
> retarded the timing. It was at 16 degrees. I know I'm going to have 
> to do this again though.
> 
> I've found my 1st 2 big vacuum leaks. The CO screw hole and the plate 
> on the back of the head that keeps the cam in. I warped it slightly 
> when I was trying to use the sprocket support. I almost broke my 
> timing chain cover like Tim. I stopped in time but still dorked up 
> that little plate. I'll pull it tomorrow and pound it flat and slip 
> the new o-ring on it.
> 
> Then I'll hunt down the others...
> 
> --- In DMCForum@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> 
> wrote:
> > Cylinders are lubricated from below. Can't have oil from above (like
> > leaking valve seals). Will foul plugs every time.
> > 
> > Is it possible your rings are stuck? They must move vertically in
> > their grooves to let micro thin layer of oil past. Remember: water 
> did
> > puddle on top of pistons while heads were off. Unfortunately Marvel
> > Mystery isn't a penetrating oil. Where it excels is finding nooks 
> and
> > crannies thicker engine oil is having hard time getting into 
> (usually
> > because oil galleries/lifters/push rods/etc are full of crap).
> > 
> > Slow cranking speed may well have been metal on metal contact.
> > 
> > You need to do compression tests on all 6 cylinders to ensure rings
> > survived. If one reads low, may have snapped a ring.
> > 
> > Just deleted a paragraph about cleaning out engine with diesel fuel
> > (flame alert). If your's is stopped up, contact me off list and I'll
> > relate experiences.
> > 
> > Bill Robertson
> > #5939
> >  
> > >--- In DMCForum@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> > > Trust me, if you'd been here, you would have noticed the instant
> > > difference in the way the engine sounded just before it started. 
> It
> > > was lack of oil pressure, lack of cranking speed and lack of
> > compression.
> > > 
> > > The oil in the cylinders is already gone. I hooked up the fuel 
> system.
> > > The car starts first time, every time. Like it was brand-new!
> > > 
> > > I cleaned the spark plugs with a wire brush on a dremel every 
> time I
> > > fouled them. They are clean.
> > > 
> > > However, the car is running disgustingly rich and needs to be 
> adjusted.
> > > 
> > > By the way, the exhaust sounds great. I'm so glad I replaced all 
> that
> > > stuff.
> > > 
> > > --- In DMCForum@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> 
> wrote:
> > > > Usually air in oil galleries is quickly ejected out top of 
> heads. Can
> > > > delay lifters for a second or two (not an issue on your car I 
> know),
> > > > but that's about it. Older domestics prime themselves every 
> time you
> > > > start car.
> > > > 
> > > > My R30 has a check valve south of filter to keep oil in, but ran
> > > > engine 2000 miles with it removed no problem (was afraid I had
> > > > introduced trash around pressure sending unit). Included 
> Thanksgiving
> > > > trip to DC burning straight 30 weight in 28 degree temps.
> > > > 
> > > > Filling oil filter isn't going to hurt anything (makes heck of 
> a mess
> > > > though, eh?), but don't think that was problem. Doesn't prime 
> pump --
> > > > 6-9 inches of air back to it. And don't forget all that air 
> rest of
> > > > the way through engine. Filling filter just gets oil to metal 
> bits
> > > faster.
> > > > 
> > > > Pouring a bunch of oil directly into cylinders is going to foul 
> your
> > > > plugs terribly. Doesn't take much residue to stop spark. And 
> once a
> > > > plug is fouled, unburned crap in cylinder just builds up like a
> > > > rolling stone gathering moss. What do electrodes on those 
> therrible
> > > > Champions look like anyway?
> > > > 
> > > > Bill Robertson
> > > > #5939
> > > > 
> > > > >--- In DMCForum@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> 
> wrote:
> > > > > I had this thought this morning but was afraid to voice it 
> lest I be
> > > > > wrong.
> > > > > 
> > > > > I put in Marvel Mystery Oil. Good compression. Had no oil 
> pressure
> > > > > from the oil system. Car started.
> > > > > 
> > > > > Ok. Oil pressure begets compression. Compression begets 
> combustion!
> > > > > 
> > > > > So, I primed the oil pump like I said I would. I filled the
> > filter to
> > > > > the brim and screwed it on as quick as I could.
> > > > > 
> > > > > Like I said people, when the pump is air-bound, prime it!
> > > > > 
> > > > > I own a running DeLorean!!!!!!!! It ran, and ran hot and
> > beautiful off
> > > > > "the can" (ether).
> > > > > 
> > > > > My oil pressure shot off the scale, and the light went out. 
> I'll
> > have
> > > > > to get a more accurate sender but she runs!!

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