Fire99
Well-known member
Hi all,
I'm throwing this one out there as hopefully someone has experienced a similar issue..
I'm running Caterpillar 3126b engines (the HEUI oil pressure fed injector models) and one I noticed stopped its coolant expanding in the recovery tank when hot (it didn't drop.. It just stayed at the cold line) and when it cooled down it had lost some coolant from the recovery tank (not the heat exchanger header tank)
Firstly both engines have new Cat OEM radiator caps and the issue happens with both caps on this engine (and not at all on the other)
Secondly I cannot at this point see any obvious external leaks..
Thirdly I cleaned / rebuilt the heat exchanger with new seals etc and had it professionally pressure checked. No issues
Fourthly I reinstalled the HE and pressure checked the entire engine both hot and cold. Held the cap rating +1psi for an hour without issue.
Fifth, I've run the engine up to temp from cold with the radiator cap removed. No bubbles nor nasty whiffs and the water level in the chamber remained constant. It didn't drop whilst running at all.
Sixth, no white smoke from the exhaust. In fact it ran at temperature with no smoke at all..
So on running for about 30-40 mins it must be losing half a litre but where or how is a complete mystery... but every time the engine is run with the pressure cap on etc once the engine is stone cold, there has been a coolant level drop..
Any mystery solvers out there will be much appreciated.
Nick
I'm throwing this one out there as hopefully someone has experienced a similar issue..
I'm running Caterpillar 3126b engines (the HEUI oil pressure fed injector models) and one I noticed stopped its coolant expanding in the recovery tank when hot (it didn't drop.. It just stayed at the cold line) and when it cooled down it had lost some coolant from the recovery tank (not the heat exchanger header tank)
Firstly both engines have new Cat OEM radiator caps and the issue happens with both caps on this engine (and not at all on the other)
Secondly I cannot at this point see any obvious external leaks..
Thirdly I cleaned / rebuilt the heat exchanger with new seals etc and had it professionally pressure checked. No issues
Fourthly I reinstalled the HE and pressure checked the entire engine both hot and cold. Held the cap rating +1psi for an hour without issue.
Fifth, I've run the engine up to temp from cold with the radiator cap removed. No bubbles nor nasty whiffs and the water level in the chamber remained constant. It didn't drop whilst running at all.
Sixth, no white smoke from the exhaust. In fact it ran at temperature with no smoke at all..
So on running for about 30-40 mins it must be losing half a litre but where or how is a complete mystery... but every time the engine is run with the pressure cap on etc once the engine is stone cold, there has been a coolant level drop..
Any mystery solvers out there will be much appreciated.
Nick