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Engine Covered In Oil After 4 Miles.


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#1 Chantry2

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Posted 08 August 2018 - 07:25 PM

Hi ,I have a 1275 which has 11 stud head and hif 44 carb.Just over the last few months the rocker cover has been getting oil in the external grooves. Bought new filler cap,checked crankcase breather, but it's gone to slight amount of oil to covering windscreen bottle, coil,front of engine but not under face of bonnet.
So as I didn't put engine in ,decided to remove head today.
Pistons are +20 though, number 1 and 2 piston have no carbon build up, and 3 & 4 are covered in carbon.
The valves in the head are opposite, 1 & 2 both sets carbon ed up ,3 & 4 no carbon.
Have noticed there is no breather on timing chain cover.
Any comments would be appreciated. Thanks

#2 Bat

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Posted 08 August 2018 - 07:47 PM

Hi,

What breathers have you got on the engine and how are they plumber in?

Cheers  :proud:



#3 Chantry2

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Posted 08 August 2018 - 07:59 PM

Hi,it only has crankcase breather that goes to hif 44.The timing chain cover has no breather.
Regards

#4 Chantry2

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Posted 08 August 2018 - 08:01 PM

Just noticed in title it should read after 4 miles.

#5 sonikk4

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Posted 08 August 2018 - 08:03 PM

Just noticed in title it should read after 4 miles.

 

I'll sort that for you.



#6 russo

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Posted 08 August 2018 - 09:05 PM

Probably should have taken a few more tests before removing head. ie, leak down test. Sounds to me as though it could be worn rings and pressuring crankcase.



#7 harrythehat

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Posted 09 August 2018 - 05:49 AM

Clean pistons on two and carbon on two sounds like head gasket leak on the two clean pistons

water cleans off carbon

Simples!



#8 harrythehat

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Posted 09 August 2018 - 05:50 AM

worst case scenario

cracked head



#9 unburntfuelinthemorning

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Posted 09 August 2018 - 09:15 AM

Probably should have taken a few more tests before removing head. ie, leak down test. Sounds to me as though it could be worn rings and pressuring crankcase.

What Russo said.



#10 unburntfuelinthemorning

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Posted 09 August 2018 - 09:22 AM

Pistons are +20 though, number 1 and 2 piston have no carbon build up, and 3 & 4 are covered in carbon.
The valves in the head are opposite, 1 & 2 both sets carbon ed up ,3 & 4 no carbon.

 

Clean pistons on two and carbon on two sounds like head gasket leak on the two clean pistons

water cleans off carbon

Simples!

So you are saying a head gasket leak cleaned the carbon off of pistons 1 and 2 and the valves of 3 and 4 but not pistons 3 and 4 or the valves of 1 and 2?



#11 Chantry2

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Posted 09 August 2018 - 11:44 AM

Further on ,Exhaust valves 1,5 and 8 look like this

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#12 harrythehat

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Posted 09 August 2018 - 04:45 PM

yes for sure have done head gaskets over the years, water will clean deposits in combustion chamber and pressurise crankcase if a multiple leak

picture of valve is not combustion chamber so cant tell, wouldn't expect carbon round springs unless a build up of sludge from bad maintenance

As Russo said would have been good to have had further tests before dismantling.

But you've got what you've got and have to go with it

 

I would start with having a good look at head and block you can generally see where the problem was then clean head and block down using 600 grade wet and dry a block and light oil. wipe clean use a magnifying glass check between pistons at the thinnest point for any fractures. same with the head.

cant find nothing get head skimmed

check bores and tolerances for pistons

If you do find fractures its not the end of the world they can be welded and ground down

good luck

like to hear the result



#13 KTS

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Posted 09 August 2018 - 05:40 PM

Further on ,Exhaust valves 1,5 and 8 look like this

 

hard to tell from the picture, but is it showing the head of the valve stem looking like it's been pounded with a club hammer ?



#14 Chantry2

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Posted 09 August 2018 - 07:48 PM

Yes its the head of valve stem ,3 exhausts.

#15 Chantry2

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Posted 09 August 2018 - 08:01 PM

Attached File  20180809_123745.jpg   65.97K   1 downloads




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