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laurie newman
Unregistered guest
Posted From: 195.238.249.4
Posted on Tuesday, 26 July, 2005 - 10:05 pm:   Edit PostDelete PostView Post/Check IP

My Bentley Eight, 1989, has leaking welsh plugs. Is there a short term solution to reduce or stop the leak, other than a head off and replace?

(Message approved by david_gore)
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Mark Herbstreit
New User
Username: mark_herbstreit

Post Number: 4
Registered: 5-2005
Posted on Saturday, 30 July, 2005 - 12:41 am:   Edit PostDelete PostView Post/Check IP

Laurie I am surprised none of our more formidable members have responded to your enquiry yet. I believe you may mean the weep holes are leaking as to my knowledge their is no welch plugs in a Rolls Royce block. Depending if it is water or oil leaking from the weep holes there is two solutions. If it is water then I believe the heads must come off and the o rings replaced. If it is oil then I believe some members have successfully blocked the weep holes. Please standby for further advice.
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Richard Treacy
Grand Master
Username: richard_treacy

Post Number: 855
Registered: 4-2003
Posted on Saturday, 30 July, 2005 - 02:13 am:   Edit PostDelete PostView Post/Check IP

On your '89, you are lucky.

There are indeed threaded core plugs in the heads, but none I recall in the block. Yours has three on the top by the exhaust ports and two at the front (A-bank) or two at the back (B-bank).

Earlier cars have 6 core plugs, with four inaccessable without removing the exhaust manifolds. 20,000-series cars like yours fortunately have those four replaced by three which are easily accessed without removing so much as a spark plug.

They are made of aluminium on your car (brass on earlier models), and may be removed in-situ with an Allen socket. There are three different sizes. They are made of solid aluminium and are sealed by an aluminium washer. Maybe you just need new washers.

The deafening silence is because leakage is unheard of. I doubt whether anyone has ever needed to remove a core plug on these motors because of leakage before.

If it's the weep holes which are leaking, that's a whole new and major affair. The subject is covered elsewhere on this site. In summary, if the weep holes leak water, it can be repaired in-situ, but special tools are needed, and liquid nitrogen is required to cool the liners before refitting. Out of the car, an oven is preferred to heat the block before refitting. The heads and sump must be removed, along with the pistons. Phew, what a nasty job.

RT.
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Patrick Lockyer.
Grand Master
Username: pat_lockyer

Post Number: 443
Registered: 9-2004
Posted on Sunday, 31 July, 2005 - 03:11 am:   Edit PostDelete PostView Post/Check IP

I have an idea.
For cars that are unfortunate to leak.
I think filling the surround of liner between the seals through the block drain hole with high pressure silicone applicator would do the trick.
Beforehand slacken individualy the head nuts and retorgueing to the required torque.
This in my mind should be carried out by the specialist dealers at about 100,000 miles rather than a costly engine rebuild with the head gaskets etc failing with the wet liners at some later date.
Gaskets do compress after time even with stretch bolts so a head torque at the 100 thou would be good practice.
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laurie
Unregistered guest
Posted From: 61.68.17.148
Posted on Tuesday, 02 August, 2005 - 02:01 pm:   Edit PostDelete PostView Post/Check IP

Thanks for your responses. It is coolant which is leaking and I will refer your learned comments to my car's carer.

(Message approved by david_gore)

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