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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Cam cover seal leaking oil
Post Info TOPIC: Cam cover seal leaking oil
mpok3


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Cam cover seal leaking oil
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Hi You Knowledgeable Lot!

I'm wondering if anyone can tell me what the name of the seal in this picture is? Then I'll ask Brian if he has it in stock :)
It looks easy enough to replace once I get the tank off; am I wrong?

I think this has occurred because I feed my 19mm chain between the engine and the frame (small gap!) and it gets knocked each time - oops! However, I'd rather the bike is secure every night.

Thanks all.

Mark

IMG_0586.JPG

IMG_0584.JPG



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Cubber


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RE: Seal leaking oil
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This is one of TTR's chestnut topics. bleh

Take a look here CLICKY and you will see what can be done.

I would advise you use of one of these aluminum plugs. wink

Martyn

 



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East Budleigh. Devon
mpok3


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Thanks Martyn. That looks like it's probably it! Very helpful post! :)

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pug


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Think I will be into this job on my bike soon as well you can see a little oil damp spot round the plug an rocker cover rubber gasket on that side of the motor on mine when it has a coat of dried mud on it as well.

Pug

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66T


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+1 for the plug.

If the rocker cover gasket is going to leak, it will usually leak in that corner due, I think, to the heat from the exhaust in that area. Maybe a combination of both?



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PlumasDude


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As usual, this forum provides answers that aren't easily found in the manual. I've been pondering the same leak. Thanks for the info, folks.

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TDVT


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Replaced mine last week. Loved the look of the alum/o-ring one Brian has but shipping would have been pricey. Went with the stock one,  "YAMAHA 90338-18067-00 PLUG,SPEC'L SHAPE" , if someone else is looking.



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mpok3


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Just to update everyone, I bought the Aluminum plug and it sorted it very nicely. Perfect!

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PlumasDude


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Thanks man, I was in fact looking. I'd love to buy everything from Brian but you're right on the shipping.  That Devon engineering on the aluminum plug is tempting, if its anything like his bashplate it will survive the next coming.  I suppose the only answer is to get a larger order together for Brian wink



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mpok3


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HELP! confuse

Hi all,

This one's back again!

I've recently been finding the Aluminium plug that Brian sold me has been starting to leak again. Any thoughts on why that would happen? So I thought perhaps I need to tighten the retaining bolt. I did this and it didn't seem to be able to fully tighten (i.e. it hit a max limit and then could do a full 360 turn again).

This morning on the ride to work the Aluminium plug fell out completely and oil sprayed all over the engine and my boots! no I managed to stop, put the plug back in and get to work. I've cleaned up all the oil and I'm wondering what I should do next?

Remove the plug? Clean it up? (it's probably surrounded in oil) Replace the bolt?

Any help much appreciated as I'd love to get home from work tonight! Thank you!

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TTRfan


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Hi Mark - sorry to hear of the problem cry

Are you saying the thread stripped on the retaining bolt and it has gone AWOL?  

That is the only way I can think that would allow the alloy plug to fall out.

You were lucky to find it to put back in!

It is important to have the exact bolt and washer (see here) as the retaining channel in the plug is designed around it. If the bolt is too short it will allow the plug to fall out but if too long then the end of the bolt will push against the plug shaft and twist it. This potentially will make it leak.

This is what the bolt should look like and it must have the copper washer to seal against oil leaking.

Decomp_bolt_washer cropped.jpg

 

In terms of the plug leaking, could the housing have been scratched or damaged when removing the old plug? That is the only situation that I can think of that would allow the plug to leak.

The latest version of the plug that Steve sells has a fatter O ring which can help if the housing is damaged else it is back to the standard "hammer in" plug......

Decomp_plug_ali.jpg



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mpok3


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Brian,

Thanks for the awesome (fast) reply, as usual!

Yes, I believe the retaining bolt has stripped near the top. This then allowed the plug to release while I was riding.

Just checked and the retaining bolt doesn't even have the washer (!!!). I've ordered this now and hopefully can fit it tomorrow.

Therefore I think the plug is probably fine.

The one in the picture you added looks exactly like the one I bought 18 months ago, apart from the potentially fatter o-ring you mentioned. I think the housing is fine. I made extra sure to be careful of that when fitting it.

Good thing I had my textile trousers on, which took the majority of the oil... I was wearing cream chinos on underneath! biggrin

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ttr steve


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Will be in the post for you today Mark

As long as Royal mail do their bit, you should have it tomorrow. Also will refund a bit of postage for yousmile

Steve



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mpok3


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Steve, kind of you. Thanks very much!

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TTRfan


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I am still worried that the threads in the head for the retaining bolt are stripped and that you won't get a seal cry



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mpok3


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Not as worried as me cry

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TTRfan


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Have you got a garage locally that could put a 6mm Helicoil type re-thread in it? It is easily accessible and should be a quick and simple job.



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mpok3


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Bolt and washer arrived! Thank you Steve.

When I fitted the aluminium plug last year I took the old rubber one out first, then unscrewed the retaining bolt... and very little oil leaked out.

However, this time when I went to remove the retaining bolt first (mainly because I cannot figure out how to get the aluminium plug out!), quite a bit of oil started leaking out. I quickly tightened it back up and now I'm wondering how to put the new bolt/washer on without lots of oil coming out.

Any tips? Tip the bike to the right quite a bit maybe?

Thanks for any thoughts.

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ttr steve


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Good it arrived so quicksmile

Take the cam cover off and mop up some of the oil, not as much as you might think in there.

Steve



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