Jump to content
Click here if you are having website access problems ×

Coolant leak on XFlow Inlet Manifold

Alex Sideburns

Recommended Posts

A bad morning on the driveway...


After being unused for 5 or 6 years I am getting my Xflow engined seven back on the road. I realised in this process that the inlet manifold appeared to have been leaking coolant fluid into the inlet ports from where the coolant flows through the inlet manifold to the heater elbow. Having taken some time to clear all the rust and having had both the inlet manifold and the head skimmed on its inlet face I have reassembled using Hylomar Blue on the gasket and around the central stud close to where the coolant flows.


Imagine my disappointment when rebalancing the carbs. and setting the idle mixture when i heard a hissing noise and spotted that the coolant fluid had started to drip from around this stud...a little while later I realised that the engine was overheating and began to spew steam and coolant fluid from the header tank...I think the overheating may be unrelated to the stud leak as the car had been stood idling on the drive without the fan running during the tuning process.


I had noticed white exhaust (steam pressumably?) when starting the engine so presumably the coolant is still managing to leak into the engine from the inlet manifold. The steaming stops when the engine has run for a short while.


I had also noticed occassional spitting/popping through the carbs that may be the fluid entering the cylinders?


I am now looking at removing the inlet manifold and reassembling with a fresh gasket.


Has anyone out there experienced a similar difficluty and if so how did you fix it?


Link to comment
Share on other sites

That stud screws into the cylinder head, but the hole isn't blind. This means that water can leak up the stud threads. Cure is simple. Remove stud and refit with a thread sealant, allowing it to cure before filling with water.


Don't use Hylomar on the gasket, but a smear of silicone sealant on both the head and manifold side, but only around the water passage.


Edited by - Roger King on 5 Dec 2010 19:34:18

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...