Geoff,
What do the spark plugs look like after the water loss? Any rust or rust
colored deposits? Same question for the tail pipe. Either one could mean a
minor head gasket issue or a crack in the head.
Greg
> On Dec 16, 2013, at 9:14 AM, "John Hasty" <jhhasty@gdhs.com> wrote:
>
> I'll bet it's #3 since he apparently doesn't see any leaks......
>
> -----Original Message-----
> From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
> Behalf Of Tony Drews
> Sent: Sunday, December 15, 2013 9:42 AM
> To: Geoff Byrne; Friends of Triumph
> Subject: Re: [Fot] TR3 race motor loosing water
>
> Here's a few ideas (that you may have covered already):
> 1. The radiator cap isn't the "deep neck" one needed for the stock radiator
> and the bottom sprung piece isn't sealing.
> 2. The overflow tank is plumbed so that it won't pull water back into the
> radiator from that tank (ie the hose goes in the top and doesn't reach down
> into the catch tank very far) 3. You have a minor head gasket leak or
> cracked head
>
> I've seen problem #1 (standard radiator cap used rather than "long neck"
> one) cause that kind of issue a couple of times.
>
> Cheers, Tony Drews
>
> At 06:35 AM 12/15/2013, Geoff Byrne wrote:
>> AMICI
>>
>> We have a TR3 race car which keeps loosing water from the radiator and
>> we don't know why any thoughts from the collective wisdom of FOT
>>
>>
>>
>> Problem:
>>
>> too much water/coolant pumped out of radiator
>>
>> only occurs on circuit with long straight.
>>
>> never overheats or runs too hot
>>
>> low water warning light comes on towards end of race, ( situated bottom
>> of header tank extension)
>>
>> leak down test 98% seal
>>
>> head pressure tested
>>
>> recovery cap (6 and 12 lb) fitted to header tank, overflow to recovery
>> tank (Morris 1100), drains into bottom of recovery tank, and overflow
>> to catch tank(open to atmosphere)
>>
>> initially, fluid ran from recovery tank to overflow catch tank, and
>> then vented all over engine.
>>
>> radiator serviced, obstruction in tubes found and cleared, catch tank
>> no longer overflowed.
>>
>> i.e. less fluid leaving cooling system
>>
>> using 5 blade improved impeller pump, no thermostat (1" restrictor
>> plate, bypass occluded)
>>
>> w/pump rotates at less than, or at most, equal to engine speed
>>
>> running at approx 6500rpm down straight
>>
>> at race end, after cool down, recovery tank empty (to level of recovery
>> intake pipe, recovered) and overflow catch tank is full (approx
>> 400-500ml), unable to be recovered.
>>
>> Theory: water pump putting too much water into header tank on long run
>> at 6500rpm, escapes via recovery cap.
>>
>> But, not explained-- the level in the header tank remains low.
>>
>> Any advice welcome
>>
>>
>>
>> Geoff Byrne
>>
>> TR6 Racer down under
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>>
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