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Old 04-28-2019, 02:06 PM   #1
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Confused on HEUI pump style

Hello, I have a 2003 Newmar Dutchstar with a Caterpillar Engine.
The engine has an ID marker regarding the engine that says the Engine Model is a 3126. Serial# CKM59406.
I have always understood that my engine was a 3126E. After reading about the HEUI pump issues, I have been investigating which style pump that I have on this engine. Based on the CKM serial #, I thought I would have a square type style HEUI pump. But my pump appears to be the round top style. I am having trouble seeing the oil line from the pump to determine if it has the upgrade kit installed. But to add further confusion, I was surprised to see that it is a round type HEUI pump, not square. Were some 3126E engines equipped with the round style?
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Old 04-28-2019, 03:30 PM   #2
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I'm not 100% sure of the timing of the production change over from the B series to the E and related changes to the HEUI pump it's self .
I have documents on the E series and will see what I can dig up because they are WAY to big to post here in the forums.

I believe the oil delivery line change up was from a high pressure hose to a rigid tube , that can only be seen looking down behind the pump from the top.

I'll see what I can dig up on the E series HEUI and re-post.
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Old 04-28-2019, 04:20 PM   #3
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OK, I'm back and probably just as confused as you are.

It looks as if the first application of the rectangular head HEUI pump might be the C-7 .
The 3126E manual I have has only drawings depicting the round top .

This site lists the same pump ; 1998-2003 B & E series.

http://www.davesdiesel.ca/product/ca...p-3126b-3126e/

Google turns up images of two the styles, but with no definitive date .
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Old 04-28-2019, 04:31 PM   #4
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Hi there, we are in the middle of purchasing a 2001 3883 DS with a 330 cat in it and I'm trying to learn as much as I can about this thing. I was doing a search for the HEUI pump to see if the one I was buying was a round or square and if yours is an 03 and round mine will definitely be round. This is actually a good thing cause the driver is separate on the round and cheaper to repair.
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Old 04-28-2019, 04:42 PM   #5
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Quote:
Originally Posted by New 2 Newmar View Post
Hi there, we are in the middle of purchasing a 2001 3883 DS with a 330 cat in it and I'm trying to learn as much as I can about this thing. I was doing a search for the HEUI pump to see if the one I was buying was a round or square and if yours is an 03 and round mine will definitely be round. This is actually a good thing cause the driver is separate on the round and cheaper to repair.
Welcome to iRV2. and the Newmar family .

I've got an 8 1/2 year head start on you as far as collecting info on my Cat/Freightlier combo package , any time you can't find info , send me a personal message , and I'll see what I can supply .
To send a PM , click on my user name in the top left of one of my posts and select the PM option.
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Old 04-28-2019, 06:27 PM   #6
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CAT 3126E with “square” HEUI

Greetings To All,

Not to add further confusion but I have a 2003 Discovery with a CAT 3126E and it does have the square HEUI. I’ve owned it less than 2 years and didn’t get much of Service Records, but it’s not painted yellow like everything around it. Not sure if they can be modified from one style to the other.
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Old 04-29-2019, 12:16 PM   #7
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KMB1966,

My 2003 Dutch Star ser#CKM54291 has the flat top HEUI and I always thought mine is a 3126B. Mine had the flex line replaced with the hard tube due to a oil leak that turned out not to be from the flex line but from the air compressor. Based on our ser#'s yours is just a bit newer.
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Old 04-30-2019, 03:24 PM   #8
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Looks like the round one to me?
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Old 04-30-2019, 11:00 PM   #9
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Originally Posted by New 2 Newmar View Post
Looks like the round one to me?
Yes , flat top or round; same difference ; I can't understand why the picture I pulled of the " Dave's Diesel " site shows the HEUI inverted from it's installed position .
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Old 05-01-2019, 08:08 AM   #10
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Quote:
Originally Posted by New 2 Newmar View Post
Looks like the round one to me?


Look at Skips pictures in this thread you will see the 2 types of HEUI pumps. Round or flat refers to the top of the pumps shape.

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