Patrick Campbell
13 posts
Joined: 24/10/2017 12:28:13
Location: Walton-on-Thames United Kingdom (Excluding channel Islands)
Head Gasket
Hi all,
1988 Mini Designer 998cc A+ engine with no modifications.
I have recently had a problem with the lose of coolant, why I am not sure I think it got blown out from the joint top hose to thermostat housing. I took the engine out of the car and bench ran it at idle speed with the occasional increase in revs for about 10 minutes to make sure there were no obvious leaks. I did notice that there was very minor seepage from the head gasket not enough to account for the overall lose of coolant. As far as I can see there is no sign of coolant in the oil. I removed the head studs and countersunk their sockets to remove any thread lift/pull as I understand that thread lift/pull can cause problems. I fitted a new head gasket GUG702506HG, bench ran the engine at idle speed for about 5-10 minutes with occasional increase in revs and I still had the minor coolant seepage. I had .oo4 skimmed off the head and reassembled with a new head gasket again GUG702506HG, head nuts as usual torqued to 50 ftlbs as per Haynes manual. I bench ran the engine for 3-5 minutes only at idle speed and I still have the minor coolant seepage. It appears to be from above the gasket in one place and below the gasket in another. The gasket is fitted with the copper side up.
Any ideas would be welcome.
Regards one frustrated Paddy
Posted: Jun 24, 2022 02:27 PM
John
163 posts
Joined: 09/09/2004 09:32:06
Location: DK-2000 Frederiksberg Denmark
re
Hi Thomas - I just saw your thread. (My phone ate your number, can you send an SMS or E-mail to me?) This is what KC used in the C-AHT88 head assembly thats on my car: C-AEG588 1.218 diameter nitrocarborised EN214N inlet valve C-AEG589 1.040 diameter nitrocarborised EN214N exhaust valve C-AJJ4037 Manganese-bronze valve guide - set of 8 C-AEA526 Dual valve spring set - 180lb TAM2068 Lead-free exhaust valve seat inserts ADU4905 Stem seals - latest top-hat/sprung type GUG702506HG SBU genuine Rover head gasket Ill be sending the rockers out for bushes though, as theyve started ticking a bit. Ill might freshen up the valve seats too, while Im in there, but Im going to have to see what they look like first, though.
Posted: Dec 01, 2004 12:08 AM