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opic: Engine takes a cr^p at 105000 miles
AndyB
Just Joined
Member # 205
Rate Member
posted 12-01-2001 23:52
On the way to a gmc dealer to have engine looked at. Before I made it, rod was thrown
thru oil pan into starter. Tech says it is toast. What could have caused it? Two weeks
earlier engine was fine. Only fault with engine to my knowledge was a possible low oil
pressure issue ( instrument reading was always the same 20-25psi, 25 at start up, 20
when warm and going down the road. I could use a little help here. Thanks AndyB
Posts: 3 | Registered: Feb 2001 | IP: Logged
kennedy
Member
Member # 236
posted 12-02-2001 10:52
Out on a limb here, but generally, the main webs crack in the vicinity of the outer main
bolt hole. This can lead to crank failure etc.
Mine went at 118k. I got a lot of "razzing" over it etc, but it is actually not to
uncommon. They fail in stock trim OR modified. I rebuilt and split another one in 6 k
miles but this one only cracked the block. I redid again with splayed main caps tp span
past the weak area and no problems since.
As for your oil psi readings, while low, it could have just been gauge/sender issues.
Unless backed up by a mechanical gauge, I'd not treat that TOO seriously. It is also
possible that one of these cracks got to the cam bearing(s) and allowed them to dump
off high pressure oil heading to the mains/rods.
[ 12-02-2001: Message edited by: kennedy ]
--------------------
John Kennedy
Kennedy Diesel
www.kennedydiesel.com
2002 Chev K2500HD Crew Cab Long bed Dmax/Allison Pewter/Tan LT On order TPW
12-10!
1996 GMC K2500HD Ext Cab Long bed 6. 5 TD 260+ HP at the rear wheels
1984 K30 SRW 6. 2 NA Headers and custom collected,2 into 1 exhaust For Sale
'01 FXDWG Black/Chrome Yellow, Thunderheader 2 into 1 exhaust (naturally) 100+ RwHP
"If I had to explain, you wouldn't understand... "
Posts: 222 | From: Loyal WI | Registered: Feb 2001 | IP: Logged
Suburban_Cowpoke
Member
Member # 384
Rate Member
posted 12-02-2001 11:53
I recall reading posts on this by gmdieseltech about the harmonic balancers failing
and causing unbalance that breaks cranks and cracks blocks. That's something to
look at.
Posts: 30 | From: Suffern, NY | Registered: Jul 2001 | IP: Logged
All times are ET (US)
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Copyright 2001-2002 GM-Diesel.com - All Rights Reserved
AndyB
Just Joined
Member # 205
Rate Member
posted 12-01-2001 23:52
On the way to a gmc dealer to have engine looked at. Before I made it, rod was thrown
thru oil pan into starter. Tech says it is toast. What could have caused it? Two weeks
earlier engine was fine. Only fault with engine to my knowledge was a possible low oil
pressure issue ( instrument reading was always the same 20-25psi, 25 at start up, 20
when warm and going down the road. I could use a little help here. Thanks AndyB
Posts: 3 | Registered: Feb 2001 | IP: Logged
kennedy
Member
Member # 236
posted 12-02-2001 10:52
Out on a limb here, but generally, the main webs crack in the vicinity of the outer main
bolt hole. This can lead to crank failure etc.
Mine went at 118k. I got a lot of "razzing" over it etc, but it is actually not to
uncommon. They fail in stock trim OR modified. I rebuilt and split another one in 6 k
miles but this one only cracked the block. I redid again with splayed main caps tp span
past the weak area and no problems since.
As for your oil psi readings, while low, it could have just been gauge/sender issues.
Unless backed up by a mechanical gauge, I'd not treat that TOO seriously. It is also
possible that one of these cracks got to the cam bearing(s) and allowed them to dump
off high pressure oil heading to the mains/rods.
[ 12-02-2001: Message edited by: kennedy ]
--------------------
John Kennedy
Kennedy Diesel
www.kennedydiesel.com
2002 Chev K2500HD Crew Cab Long bed Dmax/Allison Pewter/Tan LT On order TPW
12-10!
1996 GMC K2500HD Ext Cab Long bed 6. 5 TD 260+ HP at the rear wheels
1984 K30 SRW 6. 2 NA Headers and custom collected,2 into 1 exhaust For Sale
'01 FXDWG Black/Chrome Yellow, Thunderheader 2 into 1 exhaust (naturally) 100+ RwHP
"If I had to explain, you wouldn't understand... "
Posts: 222 | From: Loyal WI | Registered: Feb 2001 | IP: Logged
Suburban_Cowpoke
Member
Member # 384
Rate Member
posted 12-02-2001 11:53
I recall reading posts on this by gmdieseltech about the harmonic balancers failing
and causing unbalance that breaks cranks and cracks blocks. That's something to
look at.
Posts: 30 | From: Suffern, NY | Registered: Jul 2001 | IP: Logged
All times are ET (US)
Hop To:
Contact Us | GM-Diesel.com/Diesel-Truck.com
Copyright 2001-2002 GM-Diesel.com - All Rights Reserved
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