Reply
 
Thread Tools Display Modes
 
Old 02-26-2018, 10:50 PM   #1
Almost There
 
Join Date: Feb 2018
Location: Raleigh nc
Posts: 75
Help!GMC 3500 6.5l should I?

Hey guys your the expert Iím new Iíve kind of been set on the 7.3 but I just found a 98 gmc 6.5 l diesel for only 3000. They say it only has 70000 miles on it which I hope is true. Are these good engines? She said it wasnít turbo diesel but I looked up the vin and it said it was a 6.5 v8 turbo diesel???? Would it be worth it any advice would help, thanks guys
Lherrlinger is offline   Reply With Quote
Old 02-26-2018, 11:30 PM   #2
Bus Crazy
 
david.dgeorge07's Avatar
 
Join Date: May 2017
Location: Chattanooga, TN
Posts: 1,404
Year: 2001
Coachwork: Thomas
Chassis: Thomas
Engine: CAT 3126
I had a mid 90ís suburban with the 6.5. Maybe something is different with this application, but it was the least reliable vehicle Iíve ever owned.
__________________
My Build Thread:

http://www.skoolie.net/forums/f11/4-...ner-18205.html
david.dgeorge07 is offline   Reply With Quote
Old 02-27-2018, 03:05 AM   #3
Skoolie
 
Join Date: Jan 2018
Posts: 111
Basically the same motor as whatís in the Hummer H1. They arenít big power houses, but very efficient. If memory serves, 195 HP 430 ft lbs TQ when new. Iíve had good luck with the 6.5liter, Iíve had both turbo and NA versions. Hope that helps. Good luck.
RRRVBUS is offline   Reply With Quote
Old 02-27-2018, 07:22 AM   #4
Bus Crazy
 
david.dgeorge07's Avatar
 
Join Date: May 2017
Location: Chattanooga, TN
Posts: 1,404
Year: 2001
Coachwork: Thomas
Chassis: Thomas
Engine: CAT 3126
I think the difference is in the injection pump. The mechanically injected ones were great the electronically injected ones were terrible. At least the ones used in GM trucks that is.
__________________
My Build Thread:

http://www.skoolie.net/forums/f11/4-...ner-18205.html
david.dgeorge07 is offline   Reply With Quote
Old 02-27-2018, 09:09 AM   #5
Bus Nut
 
Join Date: Jul 2017
Posts: 387
Year: 1993
Coachwork: Goshen
Chassis: E350
Engine: 7.3 IDI
Rated Cap: 14
The 6.5 is a good engine for longevity but does have some issues.

First, make sure the PMD has been relocated. Heat tends to burn them out.

2nd.. make sure the harmonic balancer is in good shape. With 70k miles on it, I'd replace it. These engines are notorious for breaking cranks.. and 99% of the time, it can be linked back to a worn harmonic balancer. Yup.. a ~$70 part causing complete engine failure.

Otherwise, they are good workhorse engines. They are not power houses... but they will do work for years on end as long as basic maintenance is kept up on them.

The electronic injection pump on the newer 6.5 is sem-failure prone. They aren't terribly expensive though.
Mr4btTahoe is offline   Reply With Quote
Old 02-27-2018, 09:15 AM   #6
Bus Crazy
 
brokedown's Avatar
 
Join Date: Dec 2016
Location: St Petersburg, FL
Posts: 2,407
Year: 1997
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: Cummins 5.9
Rated Cap: 72
I knew a bus yard that was buying 6.5 buses with bad injection pumps and retrofitting one from the 6.2. The reputation I've seen for them is that the pump is the weakest spot.
__________________
Keep up with us and our build!
Follow us on Facebook, Instagram, YouTube, and Twitter
brokedown is online now   Reply With Quote
Old 02-27-2018, 10:06 AM   #7
Almost There
 
Join Date: Feb 2018
Location: Raleigh nc
Posts: 75
Gmc

So a little less reliable than the 7.3 but not a bad motor is what Iím getting from yíall. Iím a big mountain biker do you think it will hold up well with lots of mountain driving? With less power do you think it will have a significantly lower mpg? By the way yíall are awesome thanks so much for the quick responses and all the help.
Lherrlinger is offline   Reply With Quote
Old 02-27-2018, 10:18 AM   #8
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
If you plan on lots of mountain driving, the tranny will be a really big factor. Anything that lacks full lockup will generate way too much heat going up and will not provide any braking coming down. And when paired with a smaller motor, it makes for a pretty awful mountain combo that won't last long.
Tango is offline   Reply With Quote
Old 02-27-2018, 10:47 AM   #9
Almost There
 
Join Date: Feb 2018
Location: Raleigh nc
Posts: 75
Dt466

What about the dt466? Would this be an efficient mountain rig or is the 7.3 my best bet? And full lock up? Sorry I donít understand
Lherrlinger is offline   Reply With Quote
Old 02-27-2018, 10:50 AM   #10
Bus Crazy
 
brokedown's Avatar
 
Join Date: Dec 2016
Location: St Petersburg, FL
Posts: 2,407
Year: 1997
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: Cummins 5.9
Rated Cap: 72
Given the same transmission, a bigger motor is likely a better plan. But I'd take a 5.9 with a locking 6 speed transmission over a DT466 with at AT545 any day.
__________________
Keep up with us and our build!
Follow us on Facebook, Instagram, YouTube, and Twitter
brokedown is online now   Reply With Quote
Reply

Tags
asap, buying advice, buying our first bus, gmc, short bus

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 04:20 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.