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Old 07-24-2021, 04:43 AM   #1
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Diesel Basics?

It looks like we may be about to buy an older DP from my brother. It has the old mechanical 8.3 Cummins in it. I'm not familiar with diesel basics, so is there somewhere I can go to get a good crash course on the basics. I'm very mechanically inclined, and don't mind working on things myself, though I believe there are certain pools you need for a diesel that may not be in your regular arsenal.
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Old 07-24-2021, 05:11 AM   #2
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Oh man I know what you mean. My coach is currently at Cummins to get a rear main seal replaced. It has 8,400 miles on it. I don't have an answer for you on a course, but this forum has been VERY helpful. Lt Dan diagnosed my problem after my first post, and my post was bungled with inappropriate part descriptions and locations. Anyway, I know what you mean about lack of diesel engine knowledge. I've learned a ton of information over the last couple of weeks from the forum and my friend, Google.
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Old 07-24-2021, 05:59 AM   #3
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If it's a Mechanical 8.3 -my guess it's and early 90's coach.
The Very Best and most reliable power plant Cummins ever made. No special tools required for maintaining the old workhorse !
Have owned mine 20 years-239,000 on the clock-sure a few issues along the way but that's normal.
I change Oil and All filters @ 5000 miles--Rotella T4 and Wix Filters- Run the valves 100,000 miles-twice so far.
They came with 250 Hp---300 Hp--Bumped mine to 450 as I was pulling a 10,000 lb Race Trailer most of those years.
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Old 07-24-2021, 07:08 AM   #4
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Quote:
Originally Posted by Mr.Woody View Post
though I believe there are certain pools you need for a diesel that may not be in your regular arsenal.
Should've said tools, not pools lol
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Old 07-24-2021, 07:10 AM   #5
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Quote:
Originally Posted by NHRA225 View Post
If it's a Mechanical 8.3 -my guess it's and early 90's coach.
The Very Best and most reliable power plant Cummins ever made. No special tools required for maintaining the old workhorse !
Have owned mine 20 years-239,000 on the clock-sure a few issues along the way but that's normal.
I change Oil and All filters @ 5000 miles--Rotella T4 and Wix Filters- Run the valves 100,000 miles-twice so far.
They came with 250 Hp---300 Hp--Bumped mine to 450 as I was pulling a 10,000 lb Race Trailer most of those years.
thanks for that info. yeah, it's an early 90's Safari. how did you get your power that high?
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Old 07-24-2021, 07:14 AM   #6
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https://www.dieselpowerproducts.com/...ummins-83-6cta
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Old 07-24-2021, 07:15 AM   #7
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You might be able to find some old shop manuals for that engine. They arenít going to be cheap, but will make for some good reading on those trips where it rains the whole time.
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Old 07-24-2021, 07:33 AM   #8
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Here Ya Go !
I thought I'd send them---Too Large-- Send me your email and I'll send The Shop Manuals and a Complete Parts Manual. I have .
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Old 07-24-2021, 10:56 AM   #9
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Shop manuals are great for repairs, but often far too deep to get a handle on basics. And it's not diesel engines per se either. You want to get a general idea of how air brakes & air suspension work, how the Allison transmission works in concert with the engine, the cooling system, and probably how a dash a/c works in a rear engine coach.


Google locates a bunch of books that could probably help. Try this search:
https://www.google.com/search?client...ne+basics+book


I'd also search YouTube for videos on the subject.
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Old 07-24-2021, 11:03 AM   #10
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Quote:
Originally Posted by NHRA225 View Post
If it's a Mechanical 8.3 -my guess it's and early 90's coach.
The Very Best and most reliable power plant Cummins ever made. No special tools required for maintaining the old workhorse !
Have owned mine 20 years-239,000 on the clock-sure a few issues along the way but that's normal.
I change Oil and All filters @ 5000 miles--Rotella T4 and Wix Filters- Run the valves 100,000 miles-twice so far.
They came with 250 Hp---300 Hp--Bumped mine to 450 as I was pulling a 10,000 lb Race Trailer most of those years.
They were the best. Wow! 450 hp from 8.3 L. That is really amazing.
It is also amazing how many of those old engines are still running.
Quite sure the new breeds won't be at that age and mileage.
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Old 07-25-2021, 06:01 PM   #11
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Quote:
Originally Posted by NHRA225 View Post
Here Ya Go !
I thought I'd send them---Too Large-- Send me your email and I'll send The Shop Manuals and a Complete Parts Manual. I have .
Upload them to the "Files" section above. That way others will have access to the info.
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Old 07-26-2021, 01:12 PM   #12
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Just keep reading here. Ive learned more on this site than any where. My service manual helps me locate parts and what to do. But watch out for " biased opinions" ie my 60K lbs RV gets 10mpg at 75mph goes up hills like a sports car.
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Old 07-26-2021, 01:22 PM   #13
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Quote:
Originally Posted by NHRA225 View Post
If it's a Mechanical 8.3 -my guess it's and early 90's coach.
The Very Best and most reliable power plant Cummins ever made. No special tools required for maintaining the old workhorse !
Have owned mine 20 years-239,000 on the clock-sure a few issues along the way but that's normal.
I change Oil and All filters @ 5000 miles--Rotella T4 and Wix Filters- Run the valves 100,000 miles-twice so far.
They came with 250 Hp---300 Hp--Bumped mine to 450 as I was pulling a 10,000 lb Race Trailer most of those years.
Just curious, did you also change out your transmission to get up to 450 HP and allow for the the extra torque?
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Old 07-26-2021, 02:37 PM   #14
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Safari is a good coach. I had a 1995 Sahara for a number of Yrs. One of the better motor homes I’ve owned.

Mine had a fiber glass roof, aluminum skin sides and stainless steel basement doors….Cummins diesel with MD3060 Allison trans and a “Dame” dolphin mural. If it would have had a slide or two I’d likely still be driving it
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