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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 08-08-2009, 05:38 PM   #1 (permalink)
SuperiorCES
 
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Pros and Cons on the 6.5L TD

Hello, this would be my first post.

I just purchased a 1998 Express 3500 equipped with a 6.5L Turbo Diesel. Everything works, and the van has 130,000 miles.

There is an overwhelming amount of information about these engines in this forum. Almost too much to even digest. I have been reading for a while, but there is so much I can't get my rather simple question answered definitely!

Briefly, if everyone here could tell me some pros and cons on this engine, I would appreciate it. What do I need to look for? What parts should I be changing as part of my regular maintenance (That tend to wear regularly, even if they arent supposed to.)

What sort of parts failures can I be expecting in the near future? The vehicle was originally used in a large service fleet, and was maintained.

What is the average life span of this engine?

Ect.

I know all of these answers are here, but getting them together is VERY time consuming.

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Old 08-08-2009, 05:45 PM   #2 (permalink)
JMJNet
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Welcome!!!

Have you read this one on the sticky, this is where I started when I just bought my Burb:

https://www.dieselplace.com/forum/showthread.php?t=53309

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1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator

Last edited by JMJNet; 08-08-2009 at 05:46 PM.
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Old 08-08-2009, 06:24 PM   #3 (permalink)
SuperiorCES
 
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I did go through it. However, there is a lot of diagnostic information. My van runs fine!

I've managed to find out that...

1.) PMD = POS.
2.) Watch the temperature gauge carefully. An overheat can mean a cracked block quick.

I guess Im more or less looking for a top ten list. My business partner is bugging me to get this sort of info for him. Thanks.
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Old 08-08-2009, 06:41 PM   #4 (permalink)
Bison
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tell your B partner to look it up himself if he wants it so badly.
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98 GMC 2500 hd sle 6.5td ext cab l box 4x4 auto 4.10 difs 268000 km. HOME REBUILD ENGINE at 268.000 km,currently 307.000
Removed CDR an installed PROVENT CRANK CASE OIL SEPERATOR/VENTILATION VALVE,3 1/2" straight pipe.
PMD heatsink relocated to inside air stream in pass fender between batt and air filter.PMD is easely accessable.
Other mods, to nummerous to mention.
95 GMC SL 2500 6.5td ext cab sh box auto, 409.000 km,CDR vented to atmosfeer at 307 k, remote pmd, extra glow bypass/LP test switch, relocated OPS ,in cab fuel gauge .High idle switch,new paint.Foot dimmer swich for simultaniously high/low beam. The Wife's pride and joy.
89 GMC 2500 sle 4x4 ext cab 6.2 na stock 740000+ km, engine rebuilt at 660000 km, rusting out now, but runs like new.
Waldon Wheelloader repowered with 6.2 na.
3 tractors dsl ,72 AC 940 whj loader,ASV 4810 Positrack skidsteer
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Old 08-08-2009, 07:24 PM   #5 (permalink)
JMJNet
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Top 3 list, unique to the 6.5:

1. Put your PMD outside the engine compartment, attach to a heatsink and fasten to the bumper or skid plate.
2. Always check the LP and OPS depending on the year, make sure that you have fuel pressure going to IP.
3. Check your grounds and keep them clean to minimize electrical issue.

Other things are like other cars, change fluid regularly, etc. No spark plugs, we have injectors and glow plugs to worry about.

Life expectancy from 10k to 1million miles, depending when your engine is made. On monday or friday, kind of a thing.
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1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator
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Old 08-08-2009, 08:12 PM   #6 (permalink)
axiom
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first of all the vans are different then the trucks in one area ... the vacuum pump is required to operate the heating and AC controls so it cant be eliminated. but a turbo master or boost fooler can be used.

second you should relocate the FSD/PMD , whether you choose the bumper or frame rail in front of the rear battery its up to you. I'd really recommend dropping a low temp thermostat into it as well being your in Florida.

anyways welcome to the place
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Old 08-08-2009, 11:34 PM   #7 (permalink)
SuperiorCES
 
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Thanks!

Thanks for what you guys have given me so far.

Im going to locate the PMD, and relocate. (If I can find and get to it. God I hate vans!) Once I do, Ill post pictures since from what I understand, the vans aren't too popular around these parts.

Anything else?
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Old 08-09-2009, 10:49 PM   #8 (permalink)
SuperiorCES
 
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Still working on the PMD. Ill get pictures when I get it done.

Veggie fuel is in the horizon. The company wants to plug earth-friendly as a business model. How does this engine take to accepting McDiesel?

Any input?
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Old 08-09-2009, 11:18 PM   #9 (permalink)
JMJNet
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From what I have read, it is not the best unless you have the knowledge of changing the IP. The Optical Sensor on the IP is very sensitive to anything that is not clear.

One other quirks that I have just remember is to make sure your starter (down below) is installed with the bracket on it. The bolt on the bracket is not easy to put on so when people change it, they tend to leave it out. Hence it is wiggling out of control with vibration.
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1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator
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Old 08-10-2009, 07:54 AM   #10 (permalink)
phalfhide
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also check the crank pulley/harmonic balancer as it has rubber on it and as your van has over 100,000 it need to be inspected

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1996 GMC Suburban C1500 6.5 Diesel "F"
3.42 Gears. Good highway Gears.
New I.P.at 93000 miles. (Previous Owner)
Relocated PMD in front bumper #9 Risistor.
Heath Turbo Master !WOW! POWER
7/16/09 removed vac pump. Engine runs much Better.
6/12/12 Replaced Steel rims with OEM 2500 aluminum rims. Cant beleive how heavy the steel rims are.Very very little improvement in MPG.
11/4/12 Replaced Cytalytic Converter with Fake.(inspection in my State) BIg differance.

6/27/14 270,905 New injector pump from Heath diesel The one from the dealership is junk
270,905on Original Engine and still going strong.
Next owner is the junk yard!
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