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Pressured Oil Leak-A-10 SR Head bolt #508892
10/03/13 6:24 pm
10/03/13 6:24 pm
Joined: Aug 2013
Posts: 86
Iowa, USA
1
1958superrocket Offline OP
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1958superrocket  Offline OP
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Joined: Aug 2013
Posts: 86
Iowa, USA
Just got back from a 25 mile ride on my 58 SR to find an oil leak on the top LH side of the motor, running down and oiling up the LH side of the bike. Thought I might have fractured the rocker feed line but cleaned everything off and started the bike up, oil is coming out around the LH rear exposed head bolt? Romove head and replace gasket, re-install and retorque? Rabers built the motor and the guy that had the bike before me said he retorqued after a few heat cycles?? Now I'm doubting that. Any other major problems I could be looking at? Thanks.

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Re: Pressured Oil Leak-A-10 SR Head bolt [Re: 1958superrocket] #508942
10/04/13 6:35 am
10/04/13 6:35 am
Joined: Oct 2001
Posts: 529
Norway
Ola Offline
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Ola  Offline
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Joined: Oct 2001
Posts: 529
Norway
Remove the bolt, put a smear of gasket cement under the washer and nut and retork.

Regards


There are no bosses in a technical discussion
(Doug Hele, 1919 - 2001)
Re: Pressured Oil Leak-A-10 SR Head bolt [Re: 1958superrocket] #508959
10/04/13 11:01 am
10/04/13 11:01 am
Joined: May 2013
Posts: 4,999
Rotherham - S. Yorkshire
Allan Gill Offline

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Allan Gill  Offline

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Joined: May 2013
Posts: 4,999
Rotherham - S. Yorkshire
I'd whip the barrel and head off and make sure both surfaces are flat. Replace with a new head gasket and see what your results are. If everything is flat and there is no scoring, I would then look at seeing if the head has cracks in it. Dry the combustion chamber with a dry cloth and sprinkle in some talc. If anything is there, it will soak the talc.


beerchug
Re: Pressured Oil Leak-A-10 SR Head bolt [Re: Allan Gill] #508981
10/04/13 12:43 pm
10/04/13 12:43 pm
Joined: Aug 2013
Posts: 86
Iowa, USA
1
1958superrocket Offline OP
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1958superrocket  Offline OP
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Joined: Aug 2013
Posts: 86
Iowa, USA
Thanks for the input. I'm thinking pulling the head and checking the gasket is the way to go, has to be a reason I have oil in this one bolt hole!

Re: Pressured Oil Leak-A-10 SR Head bolt [Re: 1958superrocket] #509004
10/04/13 3:46 pm
10/04/13 3:46 pm
Joined: May 2013
Posts: 4,999
Rotherham - S. Yorkshire
Allan Gill Offline

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Allan Gill  Offline

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Joined: May 2013
Posts: 4,999
Rotherham - S. Yorkshire
Good luck

There is plenty of good topics about torquing the head bolts etc which mean you don't have to strip it all off again to re-tighten.

Also, make sure your head bolts are not bottoming out! put them in without the washers first and see how far down they go. if they go down completely then your bolt length is fine. If they bottom out and there is day light under the head of the bolt, you will need to shorten the bolt (take a couple of threads off using a grinder - they should be tensile bolts which are difficult to cut) and when you fit the bolts, make sure they and the holes they are going into are dry.


beerchug
Re: Pressured Oil Leak-A-10 SR Head bolt [Re: Allan Gill] #509006
10/04/13 4:16 pm
10/04/13 4:16 pm
Joined: Aug 2013
Posts: 86
Iowa, USA
1
1958superrocket Offline OP
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1958superrocket  Offline OP
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1

Joined: Aug 2013
Posts: 86
Iowa, USA
The only way that the rear exterior LH hole could obtain oil would be from the rocker box above running down and then getting to the bolt at a gasket issue, thus being forced back up, correct. If the gasket was compromised at the cylinder, the LH bank would be smoking and it is not. What is the proper torque setting if I may ask.
thanks
Tim

Re: Pressured Oil Leak-A-10 SR Head bolt [Re: 1958superrocket] #509019
10/04/13 6:54 pm
10/04/13 6:54 pm
Joined: Feb 2010
Posts: 387
Upstate NY
R
Red Lapierre Offline
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Red Lapierre  Offline
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R

Joined: Feb 2010
Posts: 387
Upstate NY
What is the proper torque setting if I may ask? That is a question I ask recently but no reply on Alum head just C.I (35 FP).
Just removing one bolt is a way IMO that could cause head to warp.
They have a order to come off and on which if not followed could warp head.
Try replacing rocker box gasket and when you have apart look for cracks on head and rocker box. Check torque on head bolts put back together. If that don't work then pull head replace gasket.


57 A10 GF
61 A7
61 A10 GF
63 A10 SR
76 CB 125 Honda
76 FLH
2012 FLHTP
Re: Pressured Oil Leak-A-10 SR Head bolt [Re: Red Lapierre] #509029
10/04/13 8:38 pm
10/04/13 8:38 pm
Joined: Aug 2001
Posts: 79
Maida Vale, Western Australia
R
Richard Kal Offline
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Richard Kal  Offline
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R

Joined: Aug 2001
Posts: 79
Maida Vale, Western Australia
24 ft lbs torque.

I have also had leaks on a couple of occasions from this bolt, and in each case it was an issue with the rocker feed / banjo bolt arrangement above it!

Richard

Last edited by Richard Kal; 10/04/13 8:39 pm.
Re: Pressured Oil Leak-A-10 SR Head bolt [Re: Richard Kal] #509036
10/04/13 10:08 pm
10/04/13 10:08 pm
Joined: Aug 2013
Posts: 86
Iowa, USA
1
1958superrocket Offline OP
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1958superrocket  Offline OP
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1

Joined: Aug 2013
Posts: 86
Iowa, USA
Not sure how the rocker feed arrangement above this could affect this bolt leaking? Can you elaborate?

Re: Pressured Oil Leak-A-10 SR Head bolt [Re: 1958superrocket] #509039
10/04/13 11:10 pm
10/04/13 11:10 pm
Joined: Aug 2001
Posts: 79
Maida Vale, Western Australia
R
Richard Kal Offline
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Richard Kal  Offline
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R

Joined: Aug 2001
Posts: 79
Maida Vale, Western Australia
Unsatisfactory sealing between the taper of the banjo bolt, and the tapered seat in the front of the rocker feed housing (sometimes caused by the rocker spindle being too far to the left, sometimes because of the condition / finish of the tapered seat.
Unsatisfactory seal between the rocker box / sealing washer (fibre or copper)/ rear of the rocker feed housing (might not be flat; need lapping).

Also, is there a leak from the head / rocker box joint above the head bolt? Whenever i have had a leaking head bolt, it has always been coming from the rocker box assembly above, and can be very difficult to spot.

Richard

Re: Pressured Oil Leak-A-10 SR Head bolt [Re: Richard Kal] #509085
10/05/13 9:41 am
10/05/13 9:41 am
Joined: Aug 2013
Posts: 86
Iowa, USA
1
1958superrocket Offline OP
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1958superrocket  Offline OP
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Joined: Aug 2013
Posts: 86
Iowa, USA
Everything above the head on the rocker box is dry. Oil pooled around the head bolt and runs down the cyclinder and the primary cover. I cleaned everything off and re-started the bike, oil and bubbles coming out around washer/bolt.

Re: Pressured Oil Leak-A-10 SR Head bolt [Re: 1958superrocket] #509127
10/05/13 2:45 pm
10/05/13 2:45 pm
Joined: Feb 2010
Posts: 387
Upstate NY
R
Red Lapierre Offline
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Red Lapierre  Offline
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Posts: 387
Upstate NY
pull intake rocker box cover off and see if filled with oil guessing some oil drains back thru lifters it might be plugged and backing up and engine pressure is pushing it up and out.
Fire up with cover off and see if it leaks out bolt.


57 A10 GF
61 A7
61 A10 GF
63 A10 SR
76 CB 125 Honda
76 FLH
2012 FLHTP
Re: Pressured Oil Leak-A-10 SR Head bolt [Re: Red Lapierre] #509172
10/05/13 8:45 pm
10/05/13 8:45 pm
Joined: Aug 2013
Posts: 86
Iowa, USA
1
1958superrocket Offline OP
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1958superrocket  Offline OP
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1

Joined: Aug 2013
Posts: 86
Iowa, USA
Are you saying oil isn't draining back down from the rocker box because of plugged drains? Motor was complete rebuild by Raber's less than 300 miles ago. Everything is spotless!

Re: Pressured Oil Leak-A-10 SR Head bolt [Re: 1958superrocket] #509225
10/06/13 9:16 am
10/06/13 9:16 am
Joined: Feb 2010
Posts: 387
Upstate NY
R
Red Lapierre Offline
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Red Lapierre  Offline
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R

Joined: Feb 2010
Posts: 387
Upstate NY
Yes a piece of paper gasket could have drop off filled the hole.


57 A10 GF
61 A7
61 A10 GF
63 A10 SR
76 CB 125 Honda
76 FLH
2012 FLHTP
Re: Pressured Oil Leak-A-10 SR Head bolt [Re: Red Lapierre] #509277
10/06/13 1:19 pm
10/06/13 1:19 pm
Joined: Aug 2013
Posts: 86
Iowa, USA
1
1958superrocket Offline OP
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1958superrocket  Offline OP
BritBike Forum member
1

Joined: Aug 2013
Posts: 86
Iowa, USA
Thanks, I'll check that out.


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