• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

Head gasket replacement.

mechwanabe

Member
Offline
Hello BCF members.. Need advise on 66 AH MKIII head gasket replacement.. Is it true that the engine needs to come out in order to be able to do a head gasket replacement?
I know there are some very (almost impossible) difficult to reach intake manifold nuts and who knows what else..
Any advise, I need to replace the head gasket because of oil in the coolant..
Thank you.. for any info.
66 AH
 
Country flag
Offline
No. The head comes of easily. Protect the fenders well and the radiator. I used a movers blanket you can get at Harbor Freight cheap. Best to have two people lifting as the hood support gets in the way and that puppy's heavy. Have a place to put it before you remove it (0ne with wheels is good). You should have the head ground smooth and flushed while you have it apart. Check valve seats and BE CAREFUL TO PROTECT THE OIL BANJO!
 
Country flag
Offline
mechwanabe said:
...
I know there are some very (almost impossible) difficult to reach intake manifold nuts and who knows what else..
66 AH

I believe you can/should remove the head with the manifolds still attached (you won't have to remove them unless you want to install new gaskets). Remove the carburettors at the manifold--no fun but doable--top nuts are easy but you'll have to reach underneath to get the bottom nuts (I use a stubby half-inch end wrench). Disconnect the exhaust downpipes at the manifold flanges from underneath (I use a half-inch deep socket on a couple of ratchet extensions).

It'll be heavy; you might want to remove the bonnet and use an engine hoist.
 

red57

Jedi Warrior
Country flag
Offline
Not to rain on your parade but I would do some more diagnostics before pulling the head.

If you have oil in the coolant but no coolant in the oil, you may have a "block porosity" problem. It is not real common but I have had two blocks develope this problem. The issue is the natural porosity of cast iron. There are some oil passages that are very close to water jackets and with years of rusting in the water jackets the iron becomes thinner in these areas and oil under 40-60psi can seep thru the iron into the water jackets....40+psi oil vs 7psi water = oil wins so you will usually see oil on the water but not water in the oil. (conversely with a blown head gasket you will likely see water in the oil also)

Moss and others sell a 'oilway repair kit' for this problem. The kit consistes of stainless steel tubes that you apply a sealant to and press in to line the oil passages with. I tried one of these kits several years ago but it did not work for me. One problem is that you need to totally disassemble the motor to a bare block - both for the machining and installation of the tubes and so you can clean thouroughly after installing the tubes. Second problem is that my machine shop was not able to pressure test after installation of the tubes so I assembled the motor not knowing if the problem was corrected or not and, in my case, it was not.

However, I have run my engine with this oil seeping into the water for a long time before replacing the block - I just had to flush and clean the cooling system every 500 miles or so - I would add laundry detergent to the water, run until hot, drain & flush. Sometimes it took a couple of rounds to get it clean, then fill with water & drive. One plus is you don't need to add water pump lube:smile:

To your original question, yes the head can be removed by itself but I recommend taking the hood (bonnet) off and using a hoist - these heads are increadibly heavy to lift off by hand.

Dave
 
OP
M

mechwanabe

Member
Offline
Thank you for the advise.. So far it looks like the manifolds intake/exhaust should come out with the heads. And, then remove the manifold from the heads if needed ?
 
Country flag
Offline
mechwanabe said:
Thank you for the advise.. So far it looks like the manifolds intake/exhaust should come out with the heads. And, then remove the manifold from the heads if needed ?


Not unless you suspect a leak, or plan to skim the head, or just want to replace the gasket on principle. Wouldn't hurt to re-torque the nuts.

Trust me, you won't run out of work to do on this car.
 

Keoke

Great Pumpkin
Country flag
Offline
:savewave:


:iagree:


To your original question, yes the head can be removed by itself without removing the engine but I recommend taking the hood (bonnet) off and using a hoist - these heads are incredibly heavy to lift off by hand.----KEOKE
 
Similar threads
Thread starter Title Forum Replies Date
S SaxMan's Cylinder Head Overhaul / Head Gasket Replacement Thread Spridgets 135
T Rover V8 head gasket replacement Triumph 4
Csarneson Head Gasket Seal Austin Healey 6
R Cylinder head gasket BJ8 Austin Healey 32
B TR4/4A Head gasket won't lay flat Triumph 13
Michael Oritt Head gasket question Austin Healey 17
Got_All_4 General TR Payen brand head gasket sets what's the difference Triumph 10
Simmo TR2/3/3A Head Gasket Triumph 4
KVH General Tech Head Gasket Triumph 10
RJS General TR Head Gasket Test Fit Triumph 5
D TR2/3/3A head gasket... which way up?! Triumph 8
KVH TR4/4A Blown Head Gasket? Triumph 12
T TR4/4A Head gasket sealer question Triumph 7
T TR4/4A How to prep block to reinstall head for composite gasket Triumph 3
T TR4/4A Composite vs cooper head gasket with Randall's "trick" Triumph 6
T TR4/4A This head gasket doesn't look right to me - cooling passanges partially blocked? Triumph 18
H TR4/4A Head Gasket Issue Triumph 4
Got_All_4 TR2/3/3A What direction does the head gasket go? Triumph 4
T TR4/4A Best head gasket for a 4A? Triumph 12
DornTRoriginal TR2/3/3A TR3 Head Gasket Questions Con't Triumph 3
B Victoria British Head Gasket Austin Healey 6
T TR4/4A Seems like a bad cylinder head or head gasket but what do you think? Triumph 19
G Payen XK engine head gasket -- which side is the top? Jaguar 2
KVH General TR Cylinder Head Gasket: Stay Simple? Triumph 9
S Recommendation on Head Gasket? Austin Healey 14
S Tolerance for head gasket Austin Healey 10
RickB MGB Bought 1980 MGB and got it home - head gasket? MG 15
Gliderman8 TR6 Question on installing new head gasket Triumph 2
RedTR3 TR2/3/3A How to check for cylinder-to-cylinder head gasket leak Triumph 7
B Experience with Cometic Head Gasket for BN2? Austin Healey 8
M TR2/3/3A Head gasket leaking in two places Triumph 13
S TR2/3/3A head gasket Triumph 5
AngliaGT General MG MGB GT Head Gasket - What do I need? MG 3
G TR2/3/3A TR3/TR4 Cylinder Head Gasket SElection Triumph 2
B MGB 1972 MGB, Head Gasket replaced...runs very poorly. MG 30
O HEALEY 100 Head Gasket Gone ? Austin Healey 10
J Blown head gasket in 3 min. a new record! Triumph 14
Lukens TR2/3/3A TR3 blown head gasket? Triumph 39
L 1275 Head Gasket Spridgets 7
M persistand head gasket leak 1959 mg 1600 MG 3
RedTR3 TR2/3/3A TR3 Head Gasket [Again] Triumph 4
RedTR3 TR2/3/3A TR3 Head Gasket Triumph 6
DNK The Head Gasket Triumph 27
Boink Head gasket recommendations... Spridgets 13
Morris Blew another head gasket... Spridgets 15
Stewart I sure hope its just a head gasket MG 8
6 MGB 79 MGB Head Gasket Screwup MG 7
D Head Gasket Triumph 31
M Head gasket use sealant or not Austin Healey 7
M Head Gasket Orientation Austin Healey 2

Similar threads

Top