O.K. Mac. I concur with your mechanic. But, the knocks are the indicators.
It helps to have the whole picture.
Jim Hupy
> History:
>
>
> Coach threw belts on way home from previous Shawnee rally and engine
> developed SEVERE knocking from lack of coolant circulation!
>
>
> New belts and hoses installed at local shop after front-end lift tow to
> shop.
>
>
> Tried to go to Dothan. Severe knock returned after 50 miles or so.
>
>
> Towed home and parked in driveway.
>
>
> Later, I discovered much coolant was gone, which probably caused that
> second knock which probably was the next to last straw.
>
>
> Mechanic discovered one "freeze" plug with considerable leakage and at
> least one more that were suspicious.
>
>
> Extended idle to check for leakage on replaced "freeze" plugs.
>
>
> Mechanic had already been able to hear rod or main bearing knock.
>
>
> Time for "new" engine.
>
>
> I need to check with the GMC shop in Austin, TX to see if they can do an
> engine R&R. If so, I'll get the coach hauled down there and order an S&J
> engine.
>
>
> Commuting current best option.
>
>
> I'll follow my mechanic's recommendations as best course!
>
> Mac in OKC
>
>
> P.S. Most folks who know me consider that I already have become a
> curmudgeon!
>
>
> ________________________________
> From: Gmclist on behalf of James Hupy <
> jamesh1296>
> Sent: Sunday, March 19, 2017 14:48
> To: gmclist
> Subject: Re: [GMCnet] Re Shawnee
>
> Mac, why would you idle an engine for 30 minutes? That won't even keep the
> cam bearings and valve gear lubed. Not a good idea.
> Jim Hupy
>
>
> You may use a thicker oil too, if its a bearing issue.

Good luck!
>
>
> > > Change the oil pump to one with high volume.

About two hours of
> work,
> > > get to camping. :d
> > > S. Williams
> > Its 1970's tech. I would see if a can of STP oil treatment would make
> > enough difference to make the trip.
> >
> > I put a quart of Lucas heavy duty oil stabilizer in the CFO's Honda
> > Odyssey when it developed an impendingly fatal knock. It kept it going
> for
> > a few
> > hundred more miles while she looked for something to trade it in on. As
> > far as I know, the dealer that stole it from her for next to nothing on
> > trade
> > in turned a hefty profit when he unloaded it on the next sucker without
> > fixing it (repair cost was going to be more than the value of the car). I
> > would have kept a quart of that in every subsequent oil change until the
> > engine came apart, but SWMBO doesn't like the risk of coasting to a stop
> on
> > the side of the road just to get 10 - 20,000 more miles out of a jalopy.
> > --
> > 73 23' Sequoia 4 Sale
> > 73 23' CanyonLands Parts Unit 4 Sale
> > Upper Alabama
> > "When I grow up I am going to be a curmudgeon."
>
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