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Old 04-11-2013, 07:12 PM   #1
clicheche OP
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yamaha dt175cc enduro

i have a pretty bad gearbox oil leak. probably the crank seals?
is there a decent tutorial on the site as to replacing these?

i've tried searching.
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Old 04-11-2013, 07:32 PM   #2
baloneyskin daddy
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Theres only one crank seal that could leak trans oil and it would leak into the crankcase and smoke like hell when running. If its leaking onto the ground its probably the shift shaft seal ,countershaft seal or gasket on the drainplug .
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Old 04-11-2013, 11:04 PM   #3
clicheche OP
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what is, and where is the countershaft and seal?

i reckon i know the shift shaft seal.
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Old 04-12-2013, 04:14 AM   #4
stainlesscycle
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Quote:
Originally Posted by clicheche View Post
what is, and where is the countershaft and seal?

i reckon i know the shift shaft seal.
countershaft seal is behind the sprocket.

both the shift shaft and countershaft seals are easy to fix.

there is also a shifter cover on the early dt175 (1974-1976) (held on with four bolts behind shifter) - it has a rubber o-ring around it that could leak, but that's doubtful.. what year is your dt175?


it could also leak between the crankcase halves. or a cracked case could leak... or even the clutch cover could leak.
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Old 04-12-2013, 09:26 AM   #5
lrutt
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CS seal would not have pooled oil behind it, little higher than the level. It would leak while running. Likely shifter seal, or clutch push rod as well.

As stated, easy to replace in situ. Just did it on my RT1 plus the crank seals as well.

Do you go to the Yamahaenduro.com website. Dedicated forum for these old bikes there.
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Old 04-14-2013, 11:31 AM   #6
clicheche OP
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thanks for the responses.
i have joined the yahamaenduro site as well.
this one is phenomenal though!

i am going to replace both the shift shaft and crankshaft seals.
the year of my bike is a 1980 dt175cc
so i don't know if it will have the o-ring you speak of, though i will look.
(ps:i really hope this bike runs better now that i've got por15 all over my hands from lining the incredibly rusted gas tank. looks to have done a pretty good job. thousands upon thousands of times better shape than it was prior.)

on the other side of the bike, is there a gasket for the gearbox cover or anything? that looks like it could potentially be leaking as well.

thanks a ton for the replies folks!
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Old 04-15-2013, 04:47 AM   #7
stainlesscycle
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Quote:
Originally Posted by clicheche View Post
so i don't know if it will have the o-ring you speak of, though i will look.
you do not have a separate shifter cover, so no o-ring.

clean the motor, and look for where it's weeping..
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Old 04-16-2013, 11:32 PM   #8
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pretty sure its leaking from the shift shaft. though i'll be replacing the crank shaft seal as well. is there a particular tool to loosen the crank gear?
and you're right, i don't see a separate cover... just one.
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Old 04-17-2013, 10:56 PM   #9
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hi ya.

so i'm wondering if i have to remove a philips bolt right next to the shift shaft to remove it or not...

also, do i have to disconnect the chain in order to loosen the crankshaft?
or just loosen the crankshaft?

1980 yamaha enduro 175cc
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Old 04-17-2013, 11:02 PM   #10
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looks like i don't remove the shaft... duh. just a ring and washer around it? to gain access to the seal?
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Old 04-18-2013, 03:44 AM   #11
stainlesscycle
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Originally Posted by clicheche View Post
looks like i don't remove the shaft... duh. just a ring and washer around it? to gain access to the seal?
do not need to remove shaft. if you want to remove shaft, you need to pull clutch cover, remove clutch basket, etc, because selector end of shaft is behind it.

to replace shift shaft seal, just pull the shifter lever off and remove replace seal. i do not believe the later models had the snap ring/washer/rubber boot external to the seal. the early ones did.
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Old 04-18-2013, 03:45 AM   #12
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Quote:
Originally Posted by clicheche View Post

also, do i have to disconnect the chain in order to loosen the crankshaft?
or just loosen the crankshaft?

1980 yamaha enduro 175cc
huh? loosen the crankshaft? i'm assuming this is a typo/misspoke/etc...

you mean countershaft seal? remove rear wheel, move chain off front sprocket. bend lock tab on frt sprocket. remove nut. remove sprocket. remove/replace seal. you may want to bend locktab and loosen frt sprocket nut before you remove wheel/chain so you have something to hold the frt sprocket from spinning..

there is a bushing the countershaft seal rides on. you may want to replace, or at least flip it around if the seal has worn a big groove in it.
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Old 04-18-2013, 11:15 PM   #13
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well damn it. so its the countershaft seal that is on the same side as the shift shaft seal? that's brutal. i ordered a crankshaft seal and a shift shaft seal. thought to be on the same (left) side of the bike.

would i have to drain the gear oil when changing either seal? maybe just for the shift shaft seal? not the 'countershaft' seal?
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Old 04-18-2013, 11:19 PM   #14
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well here's hoping. the dude at blackfoot motosports here in calgary said, 'so the left hand side of the bike? those two seals?' so hopefully he just ignored my blunder of calling it the crankshaft seal... is there a crankshaft seal on the bike? or am i just spouting weird words?
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Old 04-19-2013, 08:38 AM   #15
mtothef
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shop manual

please don't take this as me being a dick, but...

maybe you should get a repair manual for the bike? that would, at the very least, help you identify the parts you are talking about, and give you some reference points as to what all is going on with the bike and what people on this site giving you advice are speaking about. seriously, every single bike i ever tear into at some point or another has some moment where i am elbow deep in engine parts saying to myself "what the hell is this?" moments like those, a shop manual can be worth its weight in gold. other times, shop manuals can also be just obscure enough to frustrate the hell out of you, but most of the time they are a very solid investment.

re the seals you are talking about, the shop guy was right - "the two seals on the left side of the bike." both of them can be replaced pretty easily, as has already been mentioned. if you are careful, you don't even have to drain the oil, just lay the bike on the right hand side and work on it there. there are also crankshaft seals, one on either side of the engine, they serve to keep the engine oil OUT of the crankcase, which is itself lubricated by the premix or autolube oil. they do need periodic replacement, and usually this involves tearing the engine almost all the way apart. they are in no way related to why your gearbox oil is appearing outside the engine instead of inside where it belongs.
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