GPZ oil leak-- sightglass completely full...

Microcut · Renault 5 Driver Joined: 25 Jun 2011 Karma :

Hello,

I have had my GPZ 500s for a week now and the bike is leaking oil. The leak makes it way down to the left hand side (gear side). My knowledge of bike maintenance is 'developing' so my initial thought through some reading up may suggest an issue with the gaskets...as i had some parts of casing off (front spocket area) and there is no splash back or obvious leaking when the engine runs and revs. So it seems to originate from higher up and it is a slow graduate leak.

However, it leaks 'more' when on its side stand and less so when on the center stand. I noticed today that when it's on the center stand the oil in the sight glass completely fills it. Could it simply be that the oil was overfilled???

Previously it was always left on the side stand hence me not registering the sight glass as an indicator to the potential problem. Any thoughts?

Thanks.

MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

You've overfilled the oil, and it's splashing up the crank case breather, into the airbox, and draining out of the airbox from the airbox drain. The drain is most likely on the side of the sidestand.
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jimspeed · World Chat Champion Joined: 05 Mar 2010 Karma :

Hi it could well be that it's overfull which may be forcing oil up a breather into the airbox as I don't think there is many places for a leak on the left of the engine apart from the gear change shaft. maybe drain the oil out and refill carefully on center stand until its just below the top of the sight glass, mine takes a while to settle while filling so I put it in slowly once it gets somewhere near the right amount.
If it is overfull you can do damage to the engine by running it so do it asap. Thumbs Up

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Microcut · Renault 5 Driver Joined: 25 Jun 2011 Karma :

thanks guys. I have only done about 60 miles on and off over this week since i've had it. Do you think i have caused any damage ?

I'll drain some tomorrow morning to bring it down.

flumpy7 · Could Be A Chat Bot Joined: 31 May 2008 Karma :

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Usher4566 · Spanner Monkey Joined: 29 Apr 2011 Karma :

May be worth replacing your primary drive seal .!! Cheap and easy
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Usher4566 · Spanner Monkey Joined: 29 Apr 2011 Karma :

May be worth replacing your primary drive seal .!! Cheap and easy
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Usher4566 · Spanner Monkey Joined: 29 Apr 2011 Karma :

When I first got my bike I would take for a ride put on side stand and drip drip drip on centre stand hardly any .I narrowed.it down to primary drive seal take front sprocket off and behind there is a rubber seal pushed in casing goes hard over years and let's oil escape .cost me 3 pound and took me 20 mins to fit and no leak since amazing .not saying yours is same but could well be .check u tube watch people fitting them on other bikes
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Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

It could be the drive seal, or the gear selector seal, but since he's already said that it's over-filled with oil, that's the first thing to sort.
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Usher4566 · Spanner Monkey Joined: 29 Apr 2011 Karma :

Of course but as bikes New to him I would drop all old oil out because don't no how long its been in there smell oil because if level has gone up could be fuel in there.and next call would be changing seals for wat its worth don't cost much and if dripping when leaning my guess is same as mine primary drive or gear selector seal ..
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Microcut · Renault 5 Driver Joined: 25 Jun 2011 Karma :

Alrite guys. I'm going to drain all the oil and refill it so it's obviously below the max indicator. As i'm taking it over to my uncles who definitely knows what he's doing, we'll (he will) look at other areas including those mentioned above. I get to see this operation in ation and so get to learn a lot for the future, so you could say my issues will enable me to learn more about general maintenance and repairs Thumbs Up

BTW. When i got the bike it had a oil change literally the day before. Also, just noticed the inside of the filler cap is milky white and the sight glass has a white-ish appearance. Maybe condensation.

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Eek, it had never even occurred to me that you hadn't done an oil change as soon as you got it. It's the first thing I do on any purchased vehicle, regardless of what it might say on any service history.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

Microcut · Renault 5 Driver Joined: 25 Jun 2011 Karma :

never fear roger...see above.

smegballs · World Chat Champion Joined: 28 Oct 2007 Karma :

Just to be a pedant, the primary drive is between the crank and the gearbox (or the crank and the clutch). The seal behind the front sprocket would be the output shaft seal.

The "primary drive seal" would be the oil seals on the main bearings in a two stroke. In four strokes the bottom end and gearbox/clutch is normally all in the same oil bath anyway. Replacing the crank oil seals on a two stroke s quite a major job as you need to split the crankcases!

HTH Thumbs Up

Microcut · Renault 5 Driver Joined: 25 Jun 2011 Karma :

Drained the oil, put it back to a noticeably better level and the area still leaks as it did before. So that has clearly narrowed it down to the suggestions above, as shared by my uncle....so this is the next port of call.

Usher4566 · Spanner Monkey Joined: 29 Apr 2011 Karma :

So what u gna do .have u read other oil leak post ?
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Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Leaking down from under the sprocket cover, thick black oil, mostly after a run when the engine is hot?

Not an oil leak. Accumulated greasy crud from chain lube fling off accumulates behind the sprocket cover, melts with the heat, and drips down.

Take off the sprocket cover, clean up the area, see if your leak disappears.

Usher4566 · Spanner Monkey Joined: 29 Apr 2011 Karma :

My bets on primary drive seal or gear shaft seal
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Microcut · Renault 5 Driver Joined: 25 Jun 2011 Karma :

Microcut · Renault 5 Driver Joined: 25 Jun 2011 Karma :

Would anyone be able to describe how I would go about accessing/ removing/ replacing the primary drive seal? specifically for the GPZ 500s A3 model (1990).

I ask because I want to t sort this out but my haynes manual does not deal with this operation. I don't have that ability to just 'do it'. I kind of need some guidance to direct me.

Thanks Thumbs Up

Usher4566 · Spanner Monkey Joined: 29 Apr 2011 Karma :

Not sure on gpz try u tube but on mine remove front sprocket.and carefully prise out with screwdriver then put new one in and make sure press it in evenly don't damage New one .don't worry bout oil pudding out coz it won't but u tube helped me gain coffidence by watching some one do it on a diff bike mz sumet.
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