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Makotosun

Oil Pump End Cap?

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Oil Pump End Cap? was created by Tinkicker

Got my new DT100 home and gave it a look over.  The seller gave me the autolube pump as he said it was leaking badly, so he removed it and used premix.

The reason it was leaking is because the black pump body end cap is missing and you can see the end of the plunger.

​​​​​Does anyone know of a source of replacement for the cap?  Not listed in my parts book.

 
05 Aug 2023 09:57 #1

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Replied by Gr8uncleal on topic Oil Pump End Cap?

PM sent with a contact here in the UK.
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05 Aug 2023 10:08 #2

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Replied by Tinkicker on topic Oil Pump End Cap?

Thanks uncle Al.
05 Aug 2023 11:01 #3

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Replied by DaytonaBarnFind on topic Re:Oil Pump End Cap?

Have the same problem with a 77dt400 oil pump. Any help would be appreciated.



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07 Aug 2023 09:31 #4

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Replied by Gr8uncleal on topic Re:Oil Pump End Cap?

UK or US?
07 Aug 2023 09:35 #5

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Replied by Tinkicker on topic Re:Oil Pump End Cap?

The body counterbore where the plug fits is 21mm diameter.  I thought about a 21mm cup type freeze plug, but the counterbore is not deep enough to accomodate one.

I have ordered a 13/16" (20.5mm) welch plug instead.  I will try it with loctite to help seal it.  If I can expand it enough to lock and seal, I will report back.
Last edit: 07 Aug 2023 12:35 by Tinkicker.
07 Aug 2023 12:34 #6

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Replied by MarkT on topic Re:Oil Pump End Cap?

The original plug looks like a rubber coated cup type freeze plug except flat side goes "out" and cup side goes "in"

I was hoping it might be 22mm as that's the same as a common shift drum cap. 

Here's one that's 20mm...  www.partzilla.com/product/yamaha/90338-20023-00  Side with size numbers would face "out"

Still looking for a 21mm...  perhaps a good bearing supply would have one?

 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
07 Aug 2023 13:03 #7

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Replied by Tinkicker on topic Oil Pump End Cap?

Problem is counterbore is only about 3mm deep.
07 Aug 2023 13:20 #8

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Replied by MarkT on topic Oil Pump End Cap?

This is very close to the stock cap.  It's 5mm tall but that should not be an issue at all. Flat side faces out. 

www.avxseals.com/Shaft-Oil-Seals-EC21x5-...rs-Seal-p/ec21x5.htm
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
07 Aug 2023 13:38 #9

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Replied by MarkT on topic Oil Pump End Cap?

I was wrong.  The 21mm x 5mm shaft end cap is not close, it's exactly what Yamaha used. 

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A good bearing supply should be able to get one.  Or online someplace. 

Here's a picture of an oil pump showing the size on the cap.

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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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07 Aug 2023 13:51 #10

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