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Expansion/header tank cap pressure


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Hi

What is the normal pressure rating for a expansion tank cap (mine is currently 20psi).

Reason for asking is took my Super Spec on a local track day and it was fine on the 80 mile drive down and managed 2 X 15 minute track sessions but on the 3rd session it decided to over heat and push all the coolant into a collection bottle I have running off the header tank.

Filled it back up and it seemed ok on idle (got up to temp and a little after fan kicked in) but decided to call it a day as far as track was concerned, but about 6 or 7 miles of driving back temp shot up again (120 degrees) then dropped a little only for it to shoot back up so had to get the "ride of shame" home.

I'm going through the cooling system bit by bit so looking for any ideas to try

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Check thermostat is opening properly and not blocked with scale,,check none of the hoses have collapsed internally and back flush the radiator are three easy ones to start with. Generally make sure everything is clear and flowing ok before you start to worry about gasket failure 

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Whoops! Payback for giving it a good thrashing 😀

Are you going to replace it yourself? Having taken the head off my Superspec twice now, as a novice mechanic I can say it's perfectly do-able and straight forward with normal tools and a torque wrench. I've got the Rover T-series overhaul manual if you want a copy of the pdf (pm me).

Also remember to replace the head gasket with the later Elring Klinger black multi-layer metal plate head gasket.

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On 10/19/2020 at 11:33 AM, AndyW said:

Whoops! Payback for giving it a good thrashing 😀

Are you going to replace it yourself? Having taken the head off my Superspec twice now, as a novice mechanic I can say it's perfectly do-able and straight forward with normal tools and a torque wrench. I've got the Rover T-series overhaul manual if you want a copy of the pdf (pm me).

Also remember to replace the head gasket with the later Elring Klinger black multi-layer metal plate head gasket.

Thing is it wasn't really "thrashed" , only got up to about 70 and wasn't really driving it anymore vigorous than I normally do, revs were only around 4500 max.

I've looked at doing it myself but lack of a garage is putting me off and I've been quoted around £400-£500 all in to sort it and they will also check the engine over for any other issues, it's a rover specialist garage and knows his onions about these engines. I've never seen so many rovers in one place!! and he's got a whole engine if I need one.

 

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A sorry tale Graeme 🥴. Two months after I got the car the left front shock absorber snapped. Story here...

This caused the coil spring and top cap to fly around between engine and rad - snapped the aux belt - wrapped itself around crankshaft pulley - seized engine - snapped cambelt. I eventually found I had several bent valves, scratched pistons, and some cracked valve guides.

I was in at the deep end as a mechanical novice, but I had lots of help from club members showing me how to strip the engine and remove the head to make the repairs. However I did need a local engineering company to clean the head and replace the valve guides for me.

Second time I had to remove the head again 9 months later to change the valve stem oil seals. I found that the gasket kit I used for the original rebuild had the wrong oil seals. There are two height variations for early/late T-series engines, and using the wrong ones caused excessive oil consumption. 

Strip down becomes easier when you’ve done it once before 😄

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