Re: gm 6.5 pickup

Posted by jdemaris on August 13, 2013 at 16:22:51 from (70.192.8.202):

In Reply to: Re: gm 6.5 pickup posted by bison on August 13, 2013 at 07:21:10:

The failure rate for GM 6.5s compared to Cummins
5.9s and Ford/IH/Navistar 6.9s and 7.3s is not the
same. Ford and Cummins were endurance tested for
heavy use whereas GM didn't even try with the
6.5s. With the Durmax they did.

I don't doubt you like your trucks. I still like
my 82, 83m and 86 trucks with 6.2s. That's not the
point. GM 6.5s are inferior by design compared to
others. Also - GM had to make many substantial
changes in the 6.5s in an effort to stop certain
failures. #8 cylinder overheating and cracking.
Crankshaft failures. Smaller main-cap bolts were
added to help prevent block cracking. The cooling
system went thought several design changes to
increase flow. Heads got beefed up to help prevent
head cracking. GM and Stanadyne spent years
trying to iron out the DS4 failures. Yes they
finally figured it out but it took them 3-4 years.
No such failures I know of during production of
the 6.9s/7.3 IDIs or 5.9 twelve-valve Cummins.
That is - except the dowel-pin issue with Cummins
in the timing case and I suppose many were fixed
no charge.

The 5.9 was a proven and test medium duty engine
and it behaved that way in Dodge trucks. Same
more-or-less with the IH 7.3 that started life as
a HD gas engine medium-duty trucks. Minor issues
with glow plugs, yes. No big design changes
needed though. When the 7.3 DI Powerstroke came
out in mid 1994 -that wasn't due to problems. Just
a desire for more output.

As to ease of repair? I wonder what you find
easier to get to on a 6.5 as compared to the
others? The glow plugs on the Fords are straight
up and easier to get to then the GMs that are
cocked at angles. Water-pump changes are the same
with both. Other then glow plugs I find little
difference between GM and Ford except the Ford/IH
engines tend to last longer. And a 5.9 Cummins
with a straight six? I find it very easy to work
on with tons of room under the hood. But I must
admit that my 92 truck with a 5.9 has 375,000
miles on it and I've done NO major repairs. Just a
radiator and a water-pump. Radiator was much
easier then for a 6.5 since the Cummins is DI and
the radiator is smaller. I've yet to come across
a 6.5 with 200K that did not need major parts
unless it already got them earlier.

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