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r2d2rv6
  • Rank:XL Board Member
  • Posts:14
  • From:USA

Date Posted:05/20/2018 10:34 PMCopy HTML

I'm having a devil of a time stopping a pesky oil leak on my LH engine cover. I've used numerous gaskets (store bought and hand made) as well as Permitex, 3 repair shops and it still drips!
The oil seems to come from the locational dowel area at the rear of the cover and the screw hole that holds the drive chain cover on. I've also been told there should be an "O" ring around the locator dowel but that doesn't make sense to me.
Anyone have any suggestions? 
tuscarawas #1
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:LH XL 250 cover

Date Posted:05/20/2018 11:28 PMCopy HTML

Hi r2d. Is this the location of the leak ?

tuscarawas #2
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:LH XL 250 cover

Date Posted:05/20/2018 11:41 PMCopy HTML

If this is the source of the leak then it could be from the cam chain tensioner lock bolt and nut, you can see the o-ring in the picture.

r2d2rv6 #3
  • Rank:XL Board Member
  • Posts:14
  • From:USA

Re:LH XL 250 cover

Date Posted:05/26/2018 11:59 PMCopy HTML

Nope, thanks for getting back. It appears to be coming from the screw hole beside the neutral switch and between the striater cover and the locator guard below the drive sprocket. I've taken a picture but haven't figured out how to upload it yet. I'm new to the forum
OZ_Sparklz #4
  • Rank:Diamond Member
  • Posts:1717
  • From:Australia

Re:LH XL 250 cover

Date Posted:05/27/2018 2:13 AMCopy HTML

Welcome to The XL Board r2d2rv6.  Noticed your comment regarding the uploading of graphics - there are tips on how to in the following category:

  
http://forum1.aimoo.com/XLBoard/FORUM-HELP-1-87252

... and in particular in this thread/topic:

http://forum1.aimoo.com/XLBoard/FORUM-HELP/UPLOADING-IMAGES-FROM-YOUR-PC-1-2213613.html

If you have any issues uploading graphics please let me know via a post in this forum or via Amail by clicking on the white envelope under my avatar.

Have a good one ... Oz :)



r2d2rv6 #5
  • Rank:XL Board Member
  • Posts:14
  • From:USA

Re:LH XL 250 cover

Date Posted:05/27/2018 1:35 PMCopy HTML

Here's a picture with the location of the leak



tuscarawas #6
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:LH XL 250 cover

Date Posted:05/27/2018 2:54 PMCopy HTML

Looks like your missing a screw just to the right of the neutral switch in the red circle.

If you think there is locating dowel in there it's most likely a  broken off screw.
tuscarawas #7
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:LH XL 250 cover

Date Posted:05/27/2018 3:03 PMCopy HTML

Location of dowels in side cover.

r2d2rv6 #8
  • Rank:XL Board Member
  • Posts:14
  • From:USA

Re:LH XL 250 cover

Date Posted:05/29/2018 5:43 PMCopy HTML

 Thanks for the response. When I took the screw out, I had to plug the hole with permatex to keep the oil from draining out. The dowels are OK. The leak seems to be coming from the joint under the drive chain.
tuscarawas #9
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:LH XL 250 cover

Date Posted:06/01/2018 1:36 AMCopy HTML

I would pull the counter shaft  sprocket and chain off. Look there for a leak at the counter shaft seal and or the case joints.
r2d2rv6 #10
  • Rank:XL Board Member
  • Posts:14
  • From:USA

Re:LH XL 250 cover

Date Posted:06/02/2018 10:42 AMCopy HTML

 OK. Thanks I'll give it a try
tuscarawas #11
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:LH XL 250 cover

Date Posted:06/02/2018 8:25 PMCopy HTML

I just noticed your counter shaft sprocket has what looks like silicon in the center. I believe it is hollow on the inside of the shaft to allow oil to flow through it and supply oil to lubricate the gears. At the end of the shaft there is a welch plug to seal off the oil passage. If that is indeed silicon someone may have tried to keep it from leaking there.  
tuscarawas #12
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:LH XL 250 cover

Date Posted:06/03/2018 3:39 AMCopy HTML

I'm curious how your sprocket is held on. Never seen that type of setup before. 
JKCanuck #13
  • Rank:Bronze Member
  • Posts:27
  • From:Canada

Re:LH XL 250 cover

Date Posted:06/05/2018 5:30 AMCopy HTML

LH....The magnesium covers can become porous from water/oxygen corrosion over the years. You might remove the cover, clean off all gasket bits, and examine around the mating surface for pitting and cracks, especially in the area you've identified. Sometimes you'll find corrosion inside that isn't obvious from outside. Copious cleaning to remove all traces of oil and carefully applied JB Weld works well enough.

        There should not be any oil coming from the screw bore next to the neutral switch. The crankcase boss for that cover screw's threads is threaded no more than 15mm deep; the only way oil could come out of there is if the boss or the cover is somehow broken. You should be able to see any damage if you remove the cover.

        Tuscawaras pointed out the oddness of the sprocket and retainer screw setup. There should be a "fixing plate" behind that rubbery-looking gizmo with the "320", held by the two allen screws. Really a strange-looking setup. You can just see the countershaft plug in the centre. Doesn't look like it's been disturbed. It also doesn't look like the seal behind the sprocket is leaking; it would be much messier around the area.

        Sometimes the oil passage from the shift fork shaft to the mainshaft needle bearing and clutch rod seal gets gouged open or cracked by the drive chain jumping off the sprocket. Major trouble, but very unlikely. Remove the sprocket to check.

        All in all, the most likely culprit is a bad, perhaps broken, gasket or a cracked or corroded cover. Another possibility is stripped threads in that screw hole. It looks like most of the cover screws have been replaced with stainless allen screws. Lots of bikes have these aftermarket items added when the original JIS  screws get mangled by Philips screw drivers. Stainless steel screws are not ideal in alumnum threads, galling easily. And, it's way too easy to over-tight allen screws, stripping out the aluminum threads. If you do remove the cover in search of the leak, be sure to use a new gasket available on ebay if not fom Honda. Make sure the little C-shaped retainer is over the neutral switch when you put the sprocket cover on. It keeps the switch from being pushed out and leaking.  JK



Go soothingly on the grease mud ... as there lies the skid demon! ...





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