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HeyPigFarmer
01-18-2008 14:51:29
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Re: 6.5 Liter Turbo Diesel in reply to Dave Sherburne NY, 01-17-2008 13:33:24
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I wasn't saying that the Cummins and the Powerstroke were without their faults. It's just the 6.5 is about the worst diesel installed following the 6.2 and then the 5.7. See a pattern forming (GM)
Sure the Cummins had it's issues. The 89 to 91 models were aweful slow due to the fact that they were not intercooled and used the H1C turbo. In 92 they were intercooled and boost pressure was cranked up to 17psi and they were a lot peppier but then the tranny really couldn't take it. The auto's burned and the manual's were the GETRAG350 which unless you overfilled it by a quart you burned out the main shaft gears. Even overfull they were only good for about 100K if you were towing a lot. In 1994 they switched to the P7100 Bosch pump, new injectors and head design. Ran a lot better and had a longer injection system life due to the inline pump. In 1994 they were still stuck at 160hp and went up from there, also turbos were changed to the HX and HY models. The down side to the 94 to 98.5 models is the Killer Dowel Pin (KDP) it falls out of the timing cover and through your timing gears. The gears are fine usually but the cover breaks causing major leakage. Or you can nip it in the bud by putting a tab on it. This is a good days worth the work to change. As for tranny's autos were better but still shaky, the manual was the NV4500 which the overdrive falls off the back. In 98.5 they switched to the 24V. More power, more noise, less reliability. The lift pumps poop out causing your VP44 to cash itself in. Then 2003, switched to the common rail and the VG turbo. No real problems. A few little hiccups, few injector problems early on, but nothing real major.
The 6.9 and 7.3 IDI's had problems with glow plugs early on, plus they were slow, and had limited power potential. All the problems common with an IDI. Nothing real big mechanically other than the cavitation issues all IH/Navistar issues have. Back to the rotary pump, not a fan of them but some people have good luck. As for the 7.3 powerstroke, they eat cam position sensors if you let your oil get sunky at all. Also on the subject of skunky oil it tends to tear out your high pressure pump that runs your injectors. The wiring harness under the valve covers tends to go to crap making it start hard, miss, maybe your glow plugs poop out with this. They don't like short trips, injectors are really really expensive and somewhat tricky to change. The 6.0's had front and rear main problems early on, the early injectors had issues but that was cleared up in 2004.5 the EGR doesn't work correctly on just about any one with a stick up to 2005, although you get better mileage with it unplugged unless you have a 2005 then you can't unplug it. If you juice these to any major level you tend to have head gasket failures. But that's when you modify them.
I'm not blind to the problems of other engines. I have driven 6.5's we had one for a farm truck, they suck. If you drive them like a car and never really work them they will go a long time if you get a good one. In military use the average life is 14,567miles per engine.
As far as seeing more powerstrokes and cummins in the repair shop I believe it. They are the number one and number two selling diesel engine in trucks. They only made the 6.5 from 1994 to 1999, they were installed in roughly 9% of the trucks sold, compared to the cummins was installed in 28% between 1989 and 2007 and the powerstroke was installed in 66% of the trucks sold between 1994 and 2007. With that many more engines out there no wonder you see that many more.
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