Bringing a 740 back to life

[Laird Scooby]

Originally Posted by Ian21401

But does it still have the bolts where the clutch pedal bracket would have been and are they securing something to the bulkhead?

I think you're right Ian, as i said i never had to do anything on my manual heaters (all auto) but seem to recall seeing a bracket in that area for the heater valve.

[Challo]

Here is the heater control valve. No clips or screws that I can see, and it seems to wiggle enough to feel like it’s loose.

I haven’t investigated the silver panel it passes through before the firewall so will check today.

Edit. The pictures won’t load the right way. Sorry

[Ian21401]

That round disc could be a blank where the clutch pushrod would have passed through the bulkhead.
The valve appears to be secured to that plate which is mounted against the bulkhead.
Is it possible to see, on the engine side of the bulkhead, any fixings from that plate which pass through the bulkhead? Inboard and about level with, or slightly below, the brake master cylinder fixings.

[Challo]

Originally Posted by Ian21401

That round disc could be a blank where the clutch pushrod would have passed through the bulkhead.
The valve appears to be secured to that plate which is mounted against the bulkhead.
Is it possible to see, on the engine side of the bulkhead, any fixings from that plate which pass through the bulkhead? Inboard and about level with, or slightly below, the brake master cylinder fixings.

There are some fixings in the engine bay firewall which can be unbolted. I’ll get these removed tomorrow and see if that allows removal of the valve.

[Challo]

Originally Posted by Ian21401

That round disc could be a blank where the clutch pushrod would have passed through the bulkhead.
The valve appears to be secured to that plate which is mounted against the bulkhead.
Is it possible to see, on the engine side of the bulkhead, any fixings from that plate which pass through the bulkhead? Inboard and about level with, or slightly below, the brake master cylinder fixings.

Managed to sort it. I undid the bolts in the engine bay but didn’t make a difference. Once i up clipped the wire from the temp control unit it was able to twist and pull out. Bit of a faff with all the pipe work and cutting the pipes to the various sizes. Refilled the coolant, ran up to temp and looks ok. Will check again tomorrow for leaks and top up the tank with some water.

Fingers crossed this is the end and I can put the carpets back in.

[Laird Scooby]

Well done Chris!

Looks like perseverance paid off! Fingers crossed you now have a leak free cooling system!

[Challo]

Originally Posted by Laird Scooby

Well done Chris!

Looks like perseverance paid off! Fingers crossed you now have a leak free cooling system!

Spoke to soon Dave as we have a leak of coolant. Strangely it’s not from any of the pipes inside or in the engine bay I removed.

Leak seems to be at the front of the engine bay, on the right hand side near the oil filter. It appears to be dripping from underneath the part highlighted in red. Is this the water pump?

Wasn’t leaking before and only seems to be happening since I drained the system and replaced the coolant.

Any ideas?

[Laird Scooby]

Originally Posted by Challo

Spoke to soon Dave as we have a leak of coolant. Strangely it’s not from any of the pipes inside or in the engine bay I removed.

Leak seems to be at the front of the engine bay, on the right hand side near the oil filter. It appears to be dripping from underneath the part highlighted in red. Is this the water pump?

Wasn’t leaking before and only seems to be happening since I drained the system and replaced the coolant.

Any ideas?

That is indeed the water pump Chris, there is a seal between it and the head but if that was leaking it would leak all over the pump, not from underneath. It could be that the radiator hose is slightly perished or maybe just not quite tight enough as sometimes fresh antifreeze can find leaks that weren't previously there.

[kiloran]

Start her up, get her up to temperature and give that hose a squeeze (with gloves on). As Dave says, hopefully just a perished or not tight enough hose but that's where my HG blew. Didn't overheat but squeezing that hose caused coolant to spray out of gasket between the head and the block. I'm sure it's not that, but that's how my blown HG revealed itself...

[Challo]

Originally Posted by Laird Scooby

That is indeed the water pump Chris, there is a seal between it and the head but if that was leaking it would leak all over the pump, not from underneath. It could be that the radiator hose is slightly perished or maybe just not quite tight enough as sometimes fresh antifreeze can find leaks that weren't previously there.

Cheers Dave. You could definitely see it dripping from underneath the water pump but difficult to find the source. I’ll dry it all off with some paper towel and feel around for any drips.