Perkins 4236 - Coolant Expansion Bottle - Should I Fit One?

[Deleted member 36384]

Just to close out the thread.

I have since run the engine without topping up for over 4 hours now and it has performed well. No water in the sump tray, plenty of hot water and engine temperature rock solid.

 

[fergycool]

OTOH
You may be simply trying to keep the HE too full. Instead of topping it up fully watch it over a longer period to see if it finds a stable level somewhat below the bottom of the filler neck, but still just covering the HE tubes. If it does then all is well . Dont keep on topping right up .... there must be a bit of expansion space left in the top of the HE!

I have a pair of 4.270. The non turbocharged predecessor of the 4.236. I had exactly the same issue until I realised what VicS has pointed out. I was always topping the header up, then I realised that the stable level was about 2/3 up the tank. Basically I never now top them up and putting my index finger in the tank always reaches the level ( when cold and I never suck my finger afterwards!).

Cheers
Ferg