1989 Mac truck with a renault diesel - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 10-07-2010, 03:07 PM   #1 (permalink)
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1989 Mac truck with a renault diesel

We are looking at picking up a 1989 mac toter for Master-Pull, but I can't find much info (good or bad) on the renault diesel that came in these trucks.



This is a pic I snapped of the engine, it's a renault straight 6 and pretty much that all I know besides the fact that it only has 78K miles on it.

The diesel doesn't make as much power as we would like, it is only going to be doing 60 or so on the freeway and not even close to that on the passes, so with basically no information can anyone tell me if theres something horrible about these engines I should know about?

-Alex
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Old 10-07-2010, 03:20 PM   #2 (permalink)
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Pull that Renault out and drop in a 8V92 Detroit. Just make sure you have ear plugs.
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Old 10-07-2010, 06:07 PM   #3 (permalink)
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renault diesel=bad news

bag of ass, tough to find parts for, not very common anymore (if ever here)

we have one in a mack midliner water tanker truck. it cant get out of its own way with any type of load on it, or on any kind of a hill. it does start very well, though. i love my macks, but would not personally own a "renaultified" version
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Old 10-07-2010, 06:31 PM   #4 (permalink)
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An 8V92 will make that Mack scream, it wont care what kind of load is on it or how big the hills are. I drove a 79 Freightliner 3 axle, cabover that had a 8V92 Detroit in it with a 10spd, 3 stage jake, and that was one of the best running rigs that I have ever driven. Gotta love the sound of those old 2 strokes.

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Old 10-07-2010, 07:06 PM   #5 (permalink)
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The old water truck at teh construction company I warked for has the reneault deisel , it was a powerless heap. Ran fine, no real problems, but it was not a good motor for a heavy working vehicle. .
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Old 10-07-2010, 08:38 PM   #6 (permalink)
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Chevymandan, it must have been a LONG time since you drove a truck.
I worked with an old coot that thought an 8V71T was a powerhouse.
An anemic 3406 CAT will walk away from any 8V92T on the road, a BC3 Cummins @ 400 horse will walk the dog on an 8V92, and both the cat and cummins COMBINED will not leak as much oil in a year compared to the Detroit in a week.
I do love the sound of the 12V71 ! as long as I am about a block away.
2 strokes are for chainsaws and motorcycles.
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Old 10-07-2010, 09:02 PM   #7 (permalink)
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Besides a no-see-um mosquito buzzin your ear, a 6-71 Detroit at idle is one of the most irritating noise ever. A Cat 1693 @ idle will turn your head fer-sure. They didn't call a GMC(Detroit Diesel) a 'general mess of crap' for nuttin.
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Old 10-07-2010, 09:26 PM   #8 (permalink)
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Its been about 15 years. The 8V71's made 318-395 HP, 900-1100 ft/lb of torque depending on the injectors. The 8V92's made 430-500 HP, 1165-1325 ft/lb of torque depending on the injectors. Oh I agree that the old 2 stroke Detroit's are a thing of the past, but they were the top dog back in there day. They were fun to drive and they sound bitchen.
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Old 10-07-2010, 09:36 PM   #9 (permalink)
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I don't know anything about it but it sure looks cool in that pic.
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Old 10-07-2010, 09:43 PM   #10 (permalink)
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The old GM diesels were the best diesels around when they were first released. They held there own like no other. The 6-71 was released in 1938 at a measly 138hp, and was continually improved up until 2004 with the 6-71TIB making 485 horsepower. Not many engines can say that they have held there own for such a long period of time.
They aren't the most fuel efficient engines, nor the most powerful, but they last a long time.
Call up Johnson and Towers in Maryland, they have a 6-71 with over 350,000hours of runtime on it, and its still chugging away. (That equates to about 21million miles )
A Silver 8V92TA (Turbo Aftercooled) rated at 545hp would be pretty nice in that rig. You would need a new transmission, and probably new gears to take the torque.

Leaktroits are all I know, so I am partial to them.

Chris
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Old 10-08-2010, 11:16 PM   #11 (permalink)
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The horrible part is that it isn't just the engine thats renault, it's the whole damn truck...
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Old 10-09-2010, 06:09 AM   #12 (permalink)
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detroits mark their territory but they are idiot simple
a 6v53 is 2 3 53s bolted together
all 53 series cylinders are the same anywhere from a 1 53 up to a 12v53
and that is why detroits are awesome
yet find a modern motor that is that simple reliable and easy to work on
you got tho rember with suggesting a repower most people are not fimilar with heavy truck motors and those who are just got out of college and know new crap or have been wrenching for years and only know old crap the old crap is much easier to work with
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Old 10-09-2010, 11:14 AM   #13 (permalink)
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I would take a 8V92TA before any of the other engines listed...
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Old 10-09-2010, 12:07 PM   #14 (permalink)
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Cummins ISX for me, thank you very much.

Quote:
The 6-71 was released in 1938 at a measly 138hp, and was continually improved up until 2004 with the 6-71TIB making 485 horsepower. Not many engines can say that they have held there own for such a long period of time.
If by "holding their own" you mean cracked heads and blower problems and... then yes. Sure. The competition wasn't very tough back in the 1940s.

I'd drop a Cummins 8.3 or Cat C12 in that thing if you are serious about keeping it. I don't know why you would keep it, there are a lot better chassis to use for a project. The cab on those mid liners is nothing to write home about.
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Old 10-09-2010, 06:43 PM   #15 (permalink)
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i thought he asked about renaults, not dd
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Old 10-13-2010, 01:47 PM   #16 (permalink)
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We ended up passing on this, looking for something faster.

-Alex
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Old 10-13-2010, 06:10 PM   #17 (permalink)
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Quote:
Originally Posted by Master-Pull View Post
We ended up passing on this, looking for something faster.

-Alex
good call on that one
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Old 10-13-2010, 07:23 PM   #18 (permalink)
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Really good call on that. Those things are dogs.
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