Is it likely i'll have a warped head?

I want to rebuild the engine on my tef20 how likely is it for the head to be warped? if head is warped I don't think i'll even bother it doesn't seem to have a headgasket problem (no oil getting into radiator and no water in oil) but what it does do is after about an hours use the radiator hose seems to get sucked in but if you open radiator cap you can hear a poof of air come out and hose perks back up so maybe it is leaking exhaust into the radiator?
 
Most likely a big air pocket stuck somewhere. As the fluid cools and contracts it sucks the hose in. Did you change the coolant recently?
 
I am with 2 tractors on this. The hose that is collapsing is too thin and flexible for what it is doing. It either needs the coil spring inside, or replace with a stronger hose. Either one is a lot cheaper than planing a head that doesn't need it.
 
Why over think things. You simply have a bad hose simple as that. Replace it and I bet your problem goes bye, bye.
 
I already replaced all the hoses and this radiator has had regular flushes and hose still gets sucked in the cap seems to be very old could that be doing it?
 
There is way to test the cooling system of the engine for a leaking head gasket. You remove the drive belt for the water pump, remove the radiator cap, block the little bypass hose off on the radiator, and put a balloon over where the radiator cap goes. If you have compression getting by the head gasket, or other leak the balloon will inflate.
 
Ah but is it the correct type hose?? If you got the wrong type hose that can be the problems
 

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