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Post by 926am on Jul 24, 2016 5:35:55 GMT -5
Hello, I'm hoping to get some ideas on a problem I'm having with my CF Moto 250: coolant leaking out of the head gasket at the front of the engine.
I recently noticed metal shavings in the oil screen, so changed out the crank and when I got it running it leaked coolant. I took the head off and had it machined flat, thinking that was the issue.
Put it all back together and when I was filling the coolant it was literally pouring out the head gasket area. While cold!
Any thoughts would be much appreciated. I'm stumped.
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Post by tortoise on Jul 24, 2016 10:27:58 GMT -5
Gasket orientation . . casting cracks?
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Post by crawford on Jul 24, 2016 13:11:31 GMT -5
You did put on new head gasket right ?
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Post by 926am on Jul 24, 2016 14:11:19 GMT -5
Yes new gasket. Dumb question: what is the proper orientation?
Didn't realize there's a top and a bottom.
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Post by crawford on Jul 24, 2016 21:34:29 GMT -5
most list top on gasket since you see the leak pull the head and look at leak area.
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Post by cyborg on Jul 26, 2016 20:29:04 GMT -5
I hate to even utter the phrase ,,,, cracked head"?
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Post by scrappydogscooters on Jul 28, 2016 16:55:50 GMT -5
Not sure of the experience and mechanical knowledge of the person that installed the head, but many back yard 'mechanics' are not aware of the critical function of incrementally torquing the head in a criss cross fashion, to the required torque settings, and not below or above that spec. If each bolt is cinched tight, then move on to the next, the head will not sit flat, and could actually warp the head, or smash the gasket unevenly, and cause coolant and compression leaks.
I would also suspect there might be another issue, but without a direct inspection, no one knows remotely, or over the internet.
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Post by 926am on Jul 29, 2016 9:29:22 GMT -5
Yes, the head was checked for cracks when it was resurfaced. I'm waiting on a new head gasket before disassembling the engine. Definitely over-torqued the head previously, but w/resurfacing & new gasket I thought I'd be good.
Certainly possible gasket was put in upside down (if that can happen)
Thanks for all the ideas, will update when I have resolution.
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Post by 4950cycle on Jul 29, 2016 13:21:28 GMT -5
I am at a loss here myself. Any possibility that crosses my mind has been stated already.
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Post by 926am on Jul 30, 2016 11:43:30 GMT -5
When I get it apart I'll check the trueness of the cylinder sleeve. If that's warped or cracked I suppose it could also be a candidate.
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Post by cuda62 on Aug 1, 2016 13:33:51 GMT -5
You said you resurfaced the head I'm betting the factory acorn nuts are bottoming out on the studs before your gasket is torque down. you might try putting one washer on each of the four studs then put your acorn nuts on and retorqueing your head. I had two brand new 250 scooters that had overheating problems right out of the crates in my shop and it took me forever to figure out the problem. the four studs were to long and the acorn nuts we're bottoming out before the gasket was smashed down sounds like the same problem your having. good luck hope this helps.
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Post by cyborg55 on Aug 2, 2016 8:32:01 GMT -5
100 points on the integrity scale to Cuda!!!!! He is on it!!!
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Post by 926am on Aug 5, 2016 5:37:22 GMT -5
Feeling really dumb here! It seems I had a breach in the bottom of the O-ring gasket for the thermostat housing. It's new, so I of course didn't consider it. The crack was hard to see & at the very bottom.
This is the nature of the hobby I guess...
Thanks for all the help & ideas.
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