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Message started by verslagen1 on 04/29/12 at 15:19:13

Title: Oil leak check
Post by verslagen1 on 04/29/12 at 15:19:13

So after fixing my head plug leak last week, I gained another leak.
sh!t there was oil everywhere. So I cleaned it all up. Hmmm... now how do I find the leak? Spray footpowder and wait? Sh!t no!

took off the valve chuck, jammed it into the breather hose, clamped it all down. Then pressurized it to 10psi and watched and listened. ok, loose bolt here, new o-ring there, aha no more leaks. 8-)

Title: Re: Oil leak check
Post by justin_o_guy2 on 04/29/12 at 16:32:59

I went to school with a guy who was smart like that,, everybody was always askin Gene for help solvin problems..

Ill always remember good old Gene,, Gene Yuss, if ya ever meet him, youll like him,

Title: Re: Oil leak check
Post by MMRanch on 07/22/15 at 21:27:59

Thats good Versey ! Just go old fashion Logic ! 8-)

So far I've been Blessed with no leaks (23,000 miles), OldRider I see a new set of new "O" rings in your future ! ::)

Title: Re: Oil leak check
Post by Bubba on 07/24/15 at 07:46:41

I do a leakdown test on my 2-strokes all the time but never thought of doing it on a 4-stroke...does the breather hose just pressurize the crankcase?

If so, that may be the way to find my minuscule leak on the stator side...

Title: Re: Oil leak check
Post by Dave on 07/24/15 at 08:42:51

6E594E4E4D1D1C141F2C0 wrote:

At this point...I dunno for sure? I don't know that the starter motor is completely air tight, or that there are no places where air won't escape though some form of vent. What we are suggesting is that the crankcase could be pressurized a small amount - and that by using a regulator the pressure could be maintained to provide a way to use soapy water or hearing to help locate where the air is escaping. Care should be taken not to put too much pressure in the crankcase and make new leaks by blowing out gaskets, seals, plugs or sealant. (One forum member blocked off the vent hose and blew out the camshaft plug while riding down the road). I was thinking about using 2-3 psi.....Versy used 10 psi and didn't blow anything up/out.

Title: Re: Oil leak check
Post by Art Webb on 07/24/15 at 08:57:27

The breather prevents (over) pressurization of the crankcase, as well as venting combustion byproducts that are harmful to the oil, the hose takes them to the airbox to be burned in the combustion process
every downstroke of the engine pressurizes the crankcase, just as the up stroke pressurizes (compresses) the combustion chamber
you might get away without a breather on a multi with a 180 degree crank (one piston goes up while the other comes down) but in a single, or a multi with a 360 degree crank, lack of a breather would blow whichever seal blows the easiest
Versy has proven the Savage motor will not puke it's seals at 10 psi, above that, who knosw?

Title: Re: Oil leak check
Post by Sonny on 07/26/15 at 22:00:07

617265647B7670727926170 wrote:

...took off the valve chuck, jammed it into the breather hose, clamped it all down. Then pressurized it to 10psi and watched and listened. ok, loose bolt here, new o-ring there, aha no more leaks. 8-)

Dang, Verslagen. For minute there you had a blown 650 single. ;-'

Title: Re: Oil leak check
Post by Dave on 09/10/15 at 09:36:18

I just did this on my new "project" bike....worked like a charm. I pressurized the crankcase to 5 psi by letting almost all the air out of the compressor before I connected to the "huff" tube. I found an oil leak at the cylinder had cap, just above the spark plug. This will require the cylinder head cap removal and new sealer......and obviously I am going to install a Verslagen Head Plug while I have it apart.

Title: Re: Oil leak check
Post by Andy RN on 06/07/17 at 10:54:57

Do you think this would work to find oil leaks in the head gasket? I think my head gasket may be leaking oil and I would like to "test" it before disassembling the engine. Thanks.

Title: Re: Oil leak check
Post by batman on 06/07/17 at 13:15:03

Andy ,no one has ever reported a head gasket leak,that we no of .Chances are it's the dreaded head plug leak.To test the head gasket you would have to bring the piston to top dead center to close the valves,and introduce air through the spark plug hole at compression pressure . and find a way to lock the piston in place to prevent it's downward movement. It would seem easier just do a compression test.or clean the motor really well ,start the bike, and then look for the origin of your leak.

Title: Re: Oil leak check
Post by verslagen1 on 06/09/17 at 09:02:47

2D392C2B2F21400 wrote:

Do you think this would work to find oil leaks in the head gasket? I think my head gasket may be leaking oil and I would like to "test" it before disassembling the engine. Thanks.

Yes, it will find any leak that's open to the breather.
And I have found my head gasket will leak thru the copper gaskets under the head bolts. I do recall removing them and greasing them to retorque the head bolts. Shoulda annealed them before putting them back on.

Title: Re: Oil leak check
Post by gizzo on 06/09/17 at 15:49:06

that's not a head gasket leak, though. a smear of rtv seals them up.

Title: Re: Oil leak check
Post by justin_o_guy2 on 06/10/17 at 08:10:26

Versy, howcum you retorqued the head?

Title: Re: Oil leak check
Post by justin_o_guy2 on 06/11/17 at 07:56:13

Odds of an actual head gasket leak are about zero. The head plug is a common problem. Versy sells an aluminum plug with o-rings . It's a permanent fix. Or, you could be seeing a had cover leak.
Head gaskets usually don't just weep a little oil. If the compression/big fire, and explosion aren't perfectly contained, the initial tiny leak will very quickly wash/cook/blast the gasket away, and it will not be a
Gee, is my head gasket leaking
moment.
Clean it up and watch where you see it start from or do what Dave did.

If someone wants to try this but doesn't have a compressor I Think an inner tube might be a start..

Title: Re: Oil leak check
Post by verslagen1 on 02/24/18 at 11:37:08

replace the o-ring. they don't last forever.

Title: Re: Oil leak check
Post by ghryx on 02/24/18 at 11:44:01

good deal. thanks.

Title: Re: Oil leak check
Post by sgtsampay on 02/26/18 at 15:54:38

This is genius! Thanks for sharing Versy! Great idea to always know about..

Title: Re: Oil leak check
Post by ghryx on 03/03/18 at 12:11:06

Replacing the o-ring on the crankcase cover and re-sealing the head cover did the trick! This little air-pressure trick was a godsend.

I do have one last little --- something --- going on.
I need to really look underneath and see what I can see. Anyone run across this before?

https://vimeo.com/258427947

Title: Re: Oil leak check
Post by verslagen1 on 03/03/18 at 16:24:54

It might be the oring on the clutch lever.

Title: Re: Oil leak check
Post by batman on 03/04/18 at 17:55:01

The leak above the exhaust header is most likely the head plug leak.

Title: Re: Oil leak check
Post by ghryx on 03/04/18 at 19:56:47

That was fixed last year, and this past week after doing the “air compressor” test I found a tiny leak in the head cover seal, and fixed that.

This little whisp of smoke is proving a little elusive... [ch128526]