P38A Still losing water

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Zorro587

Active Member
Posts
208
Hi all,

after stripping the heads, having them skimmed and all the machine is running again, but I'm still losing a bit of water and it looks like its coming from the overflow pipe by the expansion tank cap.
I've just been out and had her idling over. Squeezing the top hose to burp the system et al. Temperature got up and sat nicely at 12 o'clock.
But having a scrawm underneath I noticed the short bottom hose to the thermostat is cool, not even remotely warm. The larger hose above the thermostat is warm. The top hose was warm and getting warmer.
I've got the old thermostat still (honestly can't remember why I swapped it anyway) so I can swap that tomorrow night. The question is: is the warm upper/cool lower on the thermostat indicating that the ' stat is knackered, or that the water pump (swapped about 12 months ago) isn't playing its part, or both.
I also get a nice flow of coolant from the small hose atop the rad back into the expansion tank.
 
I found revving in neutral to 1500, sometimes 2000 with heater on full seemed to help push any air out. It can be a sod burping it all out.

Did the replacement stat have a little hole?

How's the tickover going now? Settled down a bit?
 
I found revving in neutral to 1500, sometimes 2000 with heater on full seemed to help push any air out. It can be a sod burping it all out.

Did the replacement stat have a little hole?

How's the tickover going now? Settled down a bit?
Tickover lots better. I've swapped the thermpostat back to the old one (couldn't see a hole in either mind), refilled it as per RAVE and if I had to burp it anymore I'd have put it over me shoulder and read it a bedtime story.

Its cooling down now and I'll give it a look and top-up as required shortly.
 
Tickover lots better. I've swapped the thermpostat back to the old one (couldn't see a hole in either mind), refilled it as per RAVE and if I had to burp it anymore I'd have put it over me shoulder and read it a bedtime story.

Its cooling down now and I'll give it a look and top-up as required shortly.
Try drilling a 3/16th hole in the thermostat and fit it with the hole in the 12 o clock position.
 
Without a hole the stat is in a 'dead end' when closed which can take far longer to warm up than what's circulating around the engine

The stat is supposed to be at a dead end until temperature opens it enabling flow through the radiator. The hole is for bleeding air from the system.
 
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