 Type 4 oil pump rebuild, Comparison of OEM vs. Samba CNC pump |
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| Superhawk996 |
 May 26 2019, 05:51 PM
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#1
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914 Guru  Group: Members Posts: 6,663 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch 
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Playing with the idea of what it will take to rebuild a type 4 pump.
The pump that came out of my 2.0L engine is trashed from pumping rust. Both the gears and the housings are seriously scored.  I figured I'd roll the dice and see what might be on Ebay. Took a gamble and bought a used pump hoping I might get some core parts that are useful.  I did end up with a good housing outer. However, the gears are pitted and it the inner housing plate either has a serious casting flaw, or some sort of galvanic corrosion that pitted it. I always struggle with this kind of thing. It really would have minimal effect on the pump and it probably worked OK for a lot of years. However, I'd just like to know that it is perfect going before going into a engine.   It looks like new inner plates are available but at a cost of $150+. I decided that since I have a donor "scrap" pump, I have nothing to lose by experimenting with machining it. |
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| North Coast Jim |
May 26 2019, 06:10 PM
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Member Group: Members Posts: 331 Joined: 11-December 15 From: Northern Ohio Member No.: 19,450 Region Association: MidAtlantic Region
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I bought a new Melling pump. Made in Michigan from what I've been able to determine, Its a high flow pump and is a bit thicker than stock. Runs a thinnnnnnn gasket as a result. Make sure your case is flat in the area where the gasket needs to seal. Had to take the engine out to redo the seal. Great oil pressure. $90 bucks IIRC
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| Superhawk996 |
May 26 2019, 06:23 PM
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#3
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914 Guru Group: Members Posts: 6,663 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(North Coast Jim @ May 26 2019, 08:10 PM)  I bought a new Melling pump. Made in Michigan from what I've been able to determine, Its a high flow pump and is a bit thicker than stock. Runs a thinnnnnnn gasket as a result. Make sure your case is flat in the area where the gasket needs to seal. Had to take the engine out to redo the seal. Great oil pressure. $90 bucks IIRC I've considered the Melling. Not convinced the cast iron pump in an aluminum case is the best way to go. However, of the options I've found so far a T4 rebuild actually seems most appealing as a direct fit replacement. |
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| Superhawk996 |
May 27 2019, 04:50 AM
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#4
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914 Guru Group: Members Posts: 6,663 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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@North_Coast_Jim
How many miles on the melling? Any issues with leaks or oil temp? |
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| North Coast Jim |
May 27 2019, 06:01 AM
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#5
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Member Group: Members Posts: 331 Joined: 11-December 15 From: Northern Ohio Member No.: 19,450 Region Association: MidAtlantic Region
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QUOTE(Superhawk996 @ May 27 2019, 06:50 AM) @North_Coast_Jim How many miles on the melling? Any issues with leaks or oil temp? Its a recent rebuild 2 years ago. Builder recommended the pump as he puts them into all his type IV builds. He has done rebuilds for years including some SCCA and IMSA cars back in the day. 40 years experience. Only issue with the Melling pump so far is the very then gasket. Tore the gasket on initial install and had to pull the engine to fix. Presently I do have a small leak at the junction of the case halves and the pump. Not enough to cause me concern but one day ……….. Excellent oil pressure and flow. No over heat conditions are seen. Engine has about 2000 miles on it still rebuild. |
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Posts in this topic
Superhawk996 Type 4 oil pump rebuild May 26 2019, 05:51 PM
Mark Henry Personally I'd use a new modified T1 pump and ... May 26 2019, 05:59 PM
Superhawk996
Personally I'd use a new modified T1 pump and... May 26 2019, 06:07 PM Superhawk996 I decided to start with my original pump inner hou... May 26 2019, 06:02 PM Superhawk996 So here is the cover with just a skim cut and the ... May 26 2019, 06:19 PM 914sgofast2 There is a thread over on the Samba with a step by... May 28 2019, 08:17 AM Superhawk996 Ultimately I may machine up some sort of test fixt... May 26 2019, 06:26 PM Valy Number 1 reason for failing oil pumps is the idle ... May 26 2019, 09:40 PM Superhawk996
Number 1 reason for failing oil pumps is the idle... May 27 2019, 04:28 AM Valy @Superhawk996
It works well, no issues so far but... May 27 2019, 02:12 PM Mark Henry T1 mod is easy if you have a lathe, you just have ... May 28 2019, 09:33 AM Superhawk996 Given that I'm a mechanical masochist I haven... Aug 4 2019, 10:59 AM 914sgofast2 Try visiting The Samba.com website and go to the 4... Aug 4 2019, 12:22 PM Superhawk996 :agree:
Been there before.
https://www.thesamb... Aug 4 2019, 01:00 PM Archie I've had one listed on FS/WTB for a couple of ... Aug 4 2019, 05:17 PM Superhawk996 Time to light up an old thread. I continue to bui... Sep 19 2021, 10:02 AM Superhawk996 Used T4 mystery pump.
Heres a caution to anyone ... Sep 19 2021, 10:59 AM Superhawk996 T4 Mystery Pumps -- The plot thickens
Recently bo... Dec 6 2021, 10:51 AM Nogoodwithusernames Another thing to keep an eye out for is the small ... Dec 6 2021, 01:13 PM |
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