Ford Transit MK7 2.2 tdci diesel leak, need seal info

[v8dave]

If you've got a dry torque and you put liquid sealant on it will attain a higher torque for a given setting because of the lubricating effects of the sealant used before it has cured

Err....

No, the torque is the same but the resultant clamping force on the washer is greater and the stress in the screw threads is greater.
For this reason it is unwise to use a sealant or lubricant unless it is specified.
In the case of the prv it might lead to the washer being partially squeezed out of the contact annulus which would create a leak.

To achieve any given required clamping force in any fastener the dry torque will be the highest.
Torque required for the same clamping force with any form of lubricant will be lower.
This is also important when fasteners should be replaced as factory spec parts may have a dry lubricant or pre-applied locking compound for which allowance has been made when the torque or tightening angle was specified. Anti corrosion treatments may also act as lubricants.

[Danbek1969]

And would you care to enlighten us as to how that was done ?

For the PRV I replaced the seal. Got it from a local shop here.

The Pressure sensor was cleaned and inspected, then a little locktite.

And yes, I know its important that parts are clean

No more leaks now

[davyjcb]

In layman's terms it has the same effect there is a calculation for it which goes as far as thread size,pitch substance viscosity the properties of the substance the surface area of the washer/threads of fastener ,parallel or tapered thread you'd nearly need a university degree to do the calculations an I ain't that well into it to give an exact synopsis of it.At the end of the day if you fit it to the given torque an use sealant as you say it would result in a greater clamping force and to achieve the same without the sealant it would = bigger torque

[Rhyseve]

Hi guys.

I've a similar problem. It's a fuel leak (well a seep) out of the prv on my mk7 2.4. I've recently changed the prv and had the updates done. So should I try tightening it more? Was worries with over tightening or bite the bullet and get a new one?