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DT175B crankcase breather

  • Schu
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DT175B crankcase breather was created by Schu

Ok, So if someone was dumb enough to have removed the plastic fitting and breather hose from the top of the crankcase, and then a few days later that same dumb person started cleaning the years of dirt and debris from the cylinder fins and various surrounding areas, only then to see the open hole that inevitably swallowed some filth……where would said filth end up? Just curious what would happen if someone was that stupid. 

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 Let’s assume that it was a really filthy DT175B.
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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24 Jan 2023 17:13 #1

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Replied by MarkT on topic DT175B crankcase breather

There is a little "chamber" that the vent opens into... ultimately gunk could get into trans.

Depending on how much debris made it into vent, I'd probably prop engine upside down over a bucket and pour copious amounts of diesel fuel into trans drain plug and let drain out of vent hole.
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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24 Jan 2023 17:37 #2

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Replied by Schu on topic DT175B crankcase breather

Thanks Mark. I swabbed down inside the vent hole with Q-tips and they bottom out in a short amount. The fuzzy tips brought up dirt for at least 6 swabs. I am going to do your suggestion for piece of mind. I’m still shaking my head…..
Schu

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

Someday, you'll own some Yamahas
24 Jan 2023 17:57 #3

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Replied by MarkT on topic DT175B crankcase breather

It's probably not that bad at all. 

Here's a link to an ebay set of cases so you can see the triangular chamber the vent fitting is in.  There's basically a narrow slot between the case halves that vents trans to chamber to fitting. 

ebay link

Light coat of oil or grease on q-tip might get most
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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24 Jan 2023 20:56 #4

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Replied by Schu on topic DT175B crankcase breather

Thanks for the link Mark. Now that I see the chamber area I think your suggestion of greased Q-tips would allow me to thoroughly clean it up. I’ll make sure I swab outward to avoid pushing anything thru the gap.
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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25 Jan 2023 14:26 #5

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Replied by RT325 on topic DT175B crankcase breather

Gears are pretty tough. They'll chew up anything thats not steel that fell down there. Come out in the next oil change.
25 Jan 2023 18:58 #6

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Replied by Mauser on topic DT175B crankcase breather

So it's not really a crank case breather as that wouldn't be very good on a 2 stroke :) more a transmission breather.
Yamaha RT2 360 ~ Honda XR650R ~ Kawasaki KH400 ~ KZ650B3

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26 Jan 2023 01:37 #7

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