I really hate to get involved in the great thrust debate. I kinda agree
with most of the viewpoints. But, those damn failures continue. I was
taught the thrust bearing settling procedure very early on in my career.
Engine failures from excessive thrust really started to rear their ugly
heads with high revving small block chev engines with heavy duty clutches
and 4 speed transmissions. All that end play is not a good thing. But,
Automatic transmissions with torque converters eliminated the thrust loads.
So, we need to look for other causes. Assembly accounts for some
failures, POOR BEARING MANUFACTURE IS VERY HIGH ON MY LIST OF SUSPICIONS.
No start up lube, or wrong lube on assembly is also high on my list, as is
poor break-in procedures. Lack of zinc and phosphorus additives in modern
oils is ALWAYS stated as a cause by engine builders like S and J.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Wed, Feb 20, 2019, 7:17 AM Jim Kanomata via Gmclist <
> Also the surfaces are ramped so oil film will build up as the crank
> rotates.
> Lot of tests were conducted on this by main bearing Mfg co as they were
> aware of this problem.I experienced it 4 times back in 1990's and learned a
> lot as well in2000 when we started replacing 20-30 engines a year at our
> shop.
> Crank grinders as a rule do not touch the thrust bearing area as they do
> not have the tooling to do it correctly and polish that surface to a mirror
> like finish.
>
> On Wed, Feb 20, 2019 at 6:19 AM Matt Colie via Gmclist <
>
> > Because I missed a number, I ended up buying several sets of main
> > bearings. (Good story, but you have to buy the beer to hear it.) Two of
> > the sets
> > had the Dick Paterson recommended improved oil groves. One set did not.
> > So, this is something that should be checked at assembly.
> >
> > Matt
> > --
> > Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> > Electronically Controlled Quiet Engine Cooling Fan
> > OE Rear Drum Brakes with Applied Control Arms
> > SE Michigan - Twixt A2 and Detroit
> >
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> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk
>
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