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Makotosun

Oil pump still leaks CT1C

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Replied by RT325 on topic Oil pump still leaks CT1C

Bit of a random guess but i wonder if the spring & ball on the banjo fitting leading to the cylinder are semi blocked with rubbish & its forcing the oil out there at the gasket rather than easily pumping to the cylinder. That is unlikely & can't believe i said it.
That washer would be unlikely to leak unless the bolt is loose.
30 Mar 2024 23:31 #41

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Replied by Tom P on topic Oil pump still leaks CT1C

These old washers look pretty bad. Probably just weeping, and maybe over time enough to make a small puddle below. I didn't remove the ball bearing, but It seem to be pumping fine.

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31 Mar 2024 10:02 #42

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Replied by MarkT on topic Oil pump still leaks CT1C

Find fiber if you can.  The "new" copper washers don't seem to seal as well in my experience.
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
31 Mar 2024 10:06 #43

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Replied by Tom P on topic Oil pump still leaks CT1C

Thanks Mark, I did see some old posts here that folks said copper wasn't sealing well. I cleaned up the mating surface on the pump, and the banjo is clean too.
31 Mar 2024 10:14 #44

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Replied by MarkT on topic Oil pump still leaks CT1C

Oh, and that looks really clean...  many times I've seen swarf and debris caught inside the spring. 
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
31 Mar 2024 10:18 #45

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Replied by Schu on topic Oil pump still leaks CT1C

I have reused the banjo gasket washers by scuffing them lightly across fine grit paper using my finger tip. Just enough to smooth out the imprint left behind from its original squish. 

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 this is where Morley would say “don’t do as I do, unless you want to” or something like that.
Schu

CT1B, CT1C, JT1, JT2, DT360A, GT80B, DT100B, DT125B,
DT175B, DT175C, DT250B, DT400B, Z50, SCR950

Someday, you'll own some Yamahas
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31 Mar 2024 10:19 #46

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Replied by Tom P on topic Oil pump still leaks CT1C

Mark, I cleaned the fitting and spring with brake cleaner, but they weren't too bad. Schu, these seem shot to me, and soft. I'm gonna hit Ace hardware and see what they have.
31 Mar 2024 11:06 #47

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Replied by MarkT on topic Oil pump still leaks CT1C

I'm kind of surprised...  the original banjo gaskets I usually see disintegrate with remnants stuck like glue to the pump, banjo, and bolt.  No way they could be salvaged.
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
31 Mar 2024 11:21 #48

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Replied by Tom P on topic Oil pump still leaks CT1C

No fiber washers at Ace that will fit, but they have neoprene. I don't think neoprene would stand up to two cycle oil and heat ,or am I wrong?
31 Mar 2024 13:03 #49

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Replied by MarkT on topic Oil pump still leaks CT1C

Might be okay

www.timcorubber.com/rubber-materials/neoprene-rubber/
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
31 Mar 2024 13:41 #50

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