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Post by shergar on Feb 13, 2019 21:47:32 GMT 1
hi i know iv seen a thread on here somewhere but i cant find it . i have engine oil dripping from the engine casing bolts under the engine at the fixing nuts on my 31k . they have small washers and rubber seals on them which i have changed but hasent cured the problem , any ideas ? cheers p
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Post by copper99 on Feb 13, 2019 22:09:47 GMT 1
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Post by JonW on Feb 13, 2019 22:28:29 GMT 1
Is it coming from the top, through the hole in the middle?
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Post by shergar on Feb 13, 2019 22:57:47 GMT 1
not two stroke oil as i had arrow revamp the pump . its gear oil defo and its coming down the threaded bolts that hold the engine casings together , someone said to me its because they have a pull thread on the bolts and you need to replace them each time the engine is rebuilt and if you dont the oil will find its way through the threads but i dont know .
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Post by Tobyjugs on Feb 14, 2019 2:36:08 GMT 1
The engine casings should be sealed around the studs. You should not be able to get oil on them.
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Post by Dixie Dean on Feb 14, 2019 6:20:02 GMT 1
Hi mate are you sure it's. Not coming down the hole in the middle
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Post by midlifecrisisrd on Feb 14, 2019 10:08:28 GMT 1
As said it's more likely 2 stroke oil
Usually from the non return valves in the pump passing letting oil seep into the inlet area, weep throughout the reed gaskets then down through the drain hole on the top case and drip off the studs
There should be no "seals" on the washers as the joining surfaces between the upper and lower half should have sealant on them
If not there is no way the crank cases would pass a leak down test
Steve
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Post by dusty350 on Feb 14, 2019 21:34:31 GMT 1
Clean the top of the crankcase and then lay kitchen roll under the reed rubbers, carbs etc. If you do have a leak from anywhere there, the kitchen paper will show it. Likewise, lay it on your frame tubes below the cases - will show a clutch casing leak or weep from the oil pump. The clutch case bolts go into blind castings - if the wrong bolts (too long) have been used in the past they can crack the end of the castings and oil can escape - same as if the cases have been blasted and there is blasting media left in the holes. Lack of sealant between the case halves will allow the oil to escape too. Dusty  |
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Post by JonW on Feb 15, 2019 12:01:03 GMT 1
As weve said, its always the hole in the middle of the cases, even tho it doesnt look like it.
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Post by midlifecrisisrd on Feb 15, 2019 12:29:42 GMT 1
As weve said, its always the hole in the middle of the cases, even tho it doesnt look like it. Have I had a new hair do lol Steve |
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Post by shergar on Feb 15, 2019 14:20:13 GMT 1
Clean the top of the crankcase and then lay kitchen roll under the reed rubbers, carbs etc. If you do have a leak from anywhere there, the kitchen paper will show it. Likewise, lay it on your frame tubes below the cases - will show a clutch casing leak or weep from the oil pump. The clutch case bolts go into blind castings - if the wrong bolts (too long) have been used in the past they can crack the end of the castings and oil can escape - same as if the cases have been blasted and there is blasting media left in the holes. Lack of sealant between the case halves will allow the oil to escape too. Dusty So what’s the cure ? Yes I see it coming from the hole under the casings |
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Post by JonW on Feb 15, 2019 15:03:10 GMT 1
As weve said, its always the hole in the middle of the cases, even tho it doesnt look like it. Have I had a new hair do lol Steve We've... not Ste've lol. |
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Post by kostas on Feb 15, 2019 16:19:59 GMT 1
Clean the top of the crankcase and then lay kitchen roll under the reed rubbers, carbs etc. If you do have a leak from anywhere there, the kitchen paper will show it. Likewise, lay it on your frame tubes below the cases - will show a clutch casing leak or weep from the oil pump. The clutch case bolts go into blind castings - if the wrong bolts (too long) have been used in the past they can crack the end of the castings and oil can escape - same as if the cases have been blasted and there is blasting media left in the holes. Lack of sealant between the case halves will allow the oil to escape too. Dusty So what’s the cure ? Yes I see it coming from the hole under the casings Run your finger under the reed blocks to verify where it’s coming from. If wet with oil then pull the 2stroke oil hoses from the carbs put those in two cups let them sit for a day and see if the pump check valves are leaking. |
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Post by shergar on Feb 15, 2019 16:23:55 GMT 1
iv had the pump revamped by arrow so cant see valves being the problem , p
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Post by kostas on Feb 15, 2019 16:27:37 GMT 1
You have a leak somewhere...
If your inlet line or tank was dirty the valves may pass again..
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Post by arrow on Feb 15, 2019 19:56:58 GMT 1
You have a leak somewhere... If your inlet line or tank was dirty the valves may pass again.. This is true. The valves can pass at anytime if even the tiniest debris get onto the valve seats. |
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Post by shaunyb63 on Feb 15, 2019 22:48:43 GMT 1
Always worth as i did when i had my pump done is to fit new lines and flush the oil tank clean. Small price to pay for piece of mind.
My check valves were letting oil past and leaking onto top engine case from left reed valve housing, then dripping through drain hole and onto bottom case bolt, looked for all the world it was the bottom case bolt that was leaking.
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