6.5 Diesel

94stepside5.7 · 08-15-2006, 12:18 AM

I am about to buy a 95 GMC 2500 diesel from a friend. He told me that the engine was replaced with a 97 6.5, is there any difference between the 95 and 97 6.5s? Also, how much horsepower and torque do these engines have? Thanks for the replies.

mr_goodwrench_0 · 08-15-2006, 08:04 AM

Fortunatly for you, the '97 has some cooling upgrades done to it that help when towing heavy loads. This includes a high output water pump and a dual thermostat housing. There is a well known problem with these engines, but it's an easy fix. On the side of the Injection Pump is an electronic device that tends to malfunction over time due to heat. The fix is to buy a new unit (PMD), a wiring extension and a heat sink. Mount the new PMD on the heat sink out of the engine bay and it should offer trouble free operation. Symptoms of a bad PMD include hard starting once the engine is warm, and/or intermitant stalling.

Hp is around 200 IIRC, but I'm not sure about torque.

HTH

Bill

chrisk1500 · 08-15-2006, 08:39 AM

The 97 engine also differs from the 95 in that the 97 has oil spray nozzles to cool the underside of the pistons....the material they took out of the block to fit the nozzles *may* have contributed to a weaker block in 97 and 98 (506)...

mr_goodwrench_0 · 08-15-2006, 09:04 PM

Yea, there is that too.

Bill

94stepside5.7 · 08-15-2006, 10:33 PM

Thanks for the replies guys, now I know a little more about this truck. Good to know in case I have that problem.

94stepside5.7 · 08-17-2006, 12:31 AM

What would be city and highway mpg for a 6.5 with a 5 speed manual tranny? I know it has to be better than my 5.7, Thanks for the help.

K5Fury · 08-17-2006, 05:53 AM

Anywhere from 18-24 mpg.

94stepside5.7 · 08-17-2006, 11:43 PM

Quote:

Originally Posted by K5Fury

Anywhere from 18-24 mpg.

Thats sounds great, My 5.7 only gets around 12 in the city and 16on the highway.

08-15-2006, 12:18 AM	#1
94stepside5.7 4/6 dropped Silvy on 22s Status: Offline Join Date: Jan 2006 Member ID: 40992 Pics: My Gallery Location: The Burbs, Illinois Age: 24 Posts: 1,449	6.5 Diesel I am about to buy a 95 GMC 2500 diesel from a friend. He told me that the engine was replaced with a 97 6.5, is there any difference between the 95 and 97 6.5s? Also, how much horsepower and torque do these engines have? Thanks for the replies.

08-15-2006, 08:04 AM	#2
mr_goodwrench_0 Registered User Status: Offline Join Date: Mar 2005 Member ID: 26321 Pics: My Gallery Location: Thunder Bay, Ontario Canada Age: 31 Posts: 486	Re: 6.5 Diesel Fortunatly for you, the '97 has some cooling upgrades done to it that help when towing heavy loads. This includes a high output water pump and a dual thermostat housing. There is a well known problem with these engines, but it's an easy fix. On the side of the Injection Pump is an electronic device that tends to malfunction over time due to heat. The fix is to buy a new unit (PMD), a wiring extension and a heat sink. Mount the new PMD on the heat sink out of the engine bay and it should offer trouble free operation. Symptoms of a bad PMD include hard starting once the engine is warm, and/or intermitant stalling. Hp is around 200 IIRC, but I'm not sure about torque. HTH Bill '99 2500 Suburban'07 Kawasaki Mean Streak'97 Chevy XCSB 4X4 350 Vortec 1500 '94 GMC Crew Cab 4X4 Diesel 3500

08-15-2006, 08:39 AM	#3
chrisk1500 Registered User Status: Offline Join Date: Jun 2005 Member ID: 28947 Pics: My Gallery Location: Canada Posts: 515	Re: 6.5 Diesel The 97 engine also differs from the 95 in that the 97 has oil spray nozzles to cool the underside of the pistons....the material they took out of the block to fit the nozzles may have contributed to a weaker block in 97 and 98 (506)... 95 1500 4x4, 6.5 TD, PMD cooler, #9 resistor, Heath Turbomaster, GL4 chip, ISSPRO pyro and boost gauge, custom intake, ATA IC, Heath HO injectors, 3/8" IP supply line, 4" exhaust, -1.94 TDCO, ARP head studs, Heath HO lift pump, HO waterpump, Rancho RS5000 shocks 1/4 Mile ET 16.722 @ 80.701 MPH

08-15-2006, 09:04 PM	#4
mr_goodwrench_0 Registered User Status: Offline Join Date: Mar 2005 Member ID: 26321 Pics: My Gallery Location: Thunder Bay, Ontario Canada Age: 31 Posts: 486	Re: 6.5 Diesel Yea, there is that too. Bill '99 2500 Suburban'07 Kawasaki Mean Streak'97 Chevy XCSB 4X4 350 Vortec 1500 '94 GMC Crew Cab 4X4 Diesel 3500

08-15-2006, 10:33 PM	#5
94stepside5.7 4/6 dropped Silvy on 22s Status: Offline Join Date: Jan 2006 Member ID: 40992 Pics: My Gallery Location: The Burbs, Illinois Age: 24 Posts: 1,449	Re: 6.5 Diesel Thanks for the replies guys, now I know a little more about this truck. Good to know in case I have that problem.


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08-17-2006, 12:31 AM	#6
94stepside5.7 4/6 dropped Silvy on 22s Status: Offline Join Date: Jan 2006 Member ID: 40992 Pics: My Gallery Location: The Burbs, Illinois Age: 24 Posts: 1,449	Re: 6.5 Diesel What would be city and highway mpg for a 6.5 with a 5 speed manual tranny? I know it has to be better than my 5.7, Thanks for the help. Last edited by 94stepside5.7 : 08-17-2006 at 12:33 AM.

08-17-2006, 05:53 AM	#7
K5Fury Registered User Status: Offline Join Date: Feb 2006 Member ID: 42906 Pics: My Gallery Location: Oklahoma Posts: 133	Re: 6.5 Diesel Anywhere from 18-24 mpg.

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