top hose inserts
Anyone who has done the job will know what a pain
it is to refill the RV8 cooling system when changing the coolant, or following
work on the system. With the original RV8 cooling system, filling has to be done
very slowly and, in the final stages, you are as likely to fill the valley gasket
as the cooling system, when trapped air coughs back through the filler pipe. No
amount of squeezing of the top radiator hose will fully purge air locks from the
system, and entrapped air will accumulate in the arch of the hose when the engine
is running - leading to reduced coolant flow and possible engine overheating.
Stuart sets out a detailed twelve point procedure for fitting the top
hose self-purging insert and then filling the cooling system. He concedes it still
appears fairly involved when written down step by step, but it is quite quick
and easy to carry out in practice. It normally takes 3 or 4 minutes to fill the
system from empty, rather than the 30 - 40 which has been quoted for the standard
Although his car is fitted with a non-standard brass expansion
tank, this top hose insert arrangement should work equally well with the standard
expansion tank, or the modern replacement tank available from Clive Wheatley.
Stuart is planning to make a batch of the self-purging inserts which should be
available shortly through Clive at MGV8parts.
bleed insert in the top hose
2015 Stuart McGuigan produced a bleed insert to help remove trapped air when refilling
or maintaining the RV8 cooling system. In RV8NOTE409 released in November 2015
Stuart set out a detailed
twelve point procedure for fitting the top hose
See full copy of RV8NOTE409
self purging top hose insert
Stuart McGuigan has devised an improved solution in the form of a self-purging
top hose insert fitted in the top radiator hose. A prototype fitted to his car
is performing well. The
detailed twelve point procedure is set out in a detailed article.
a full copy of RV8NOTE434