Mac 92 head gasket

[Steve carroll]

can the head gasket on 92s be reused if not damaged?is torque the same as 91 series? If not what is it?thanks.

[steveohara]

can the head gasket on 92s be reused if not damaged?is torque the same as 91 series? If not what is it?thanks.

yes and yes
Better if you resurface the gasket.
Use a flat plate and some wet/dry sand paper. I use a tool made from aluminum bar stock with the same OD as the gasket machined to have a step to secure the gasket and drag it across the paper. You can do it by hand with a lot of care to keep relocating your fingers to avoid thin spots but the tool is a much better way to go.
Steve O'Hara

[Steve carroll]

Thanks will make tool

[Vince Rosanelli]

Great question and great follow up response and advise. Outside of reusing the copper head gaskets that seem suitable to do so, is there a source to buy these new or NOS anywhere? I've had no luck finding any for the 101AA, part # 84459. Also, regarding the head bolts, I've read supporting statements for both reusing and not reusing them.

Steve O., with the extensive McCulloch experience and knowledge you have, what is your opinion on reusing the head bolts? Thanks in advance for any insight you can provide and, as always, thanks a million for all the help you post and for sharing your knowledge....

[jeff brown]

Great question and great follow up response and advise. Outside of reusing the copper head gaskets that seem suitable to do so, is there a source to buy these  new or NOS anywhere? I've had no luck finding any for the 101AA, part # 84459. Also, regarding the head bolts, I've read supporting statements for both reusing and not reusing them.

Steve O., with the extensive McCulloch experience and knowledge you have, what is your opinion on reusing the head bolts? Thanks in advance for any insight you can provide and, as always, thanks a million for all the help you post and for sharing your knowledge....

Cometic Gasket company in Ohio has all Mac copper gaskets

PART # DESCRIPTION RETAIL $  
VC297015F BM 130 KART cylinder gasket 7.80  
B1197015F BM 130 KART rotary valve gasket 7.80  
H3766005C BM 130 copper head gasket 7.80  
H3834005C WEST BEND 610 KART GASKET 8.33  
H3834020C WEST BEND 610 KART GASKET 10.95  
H3835005C WEST BEND 820 KART GASKET 8.33  
H3835020C WEST BEND 820 KART GASKET 10.93  
H3834032C WEST BEND 610 KART GASKET 26.13  
H3834010C WEST BEND 610 KART GASKET 10.95  
H3835010C WEST BEND 820 KART GASKET 10.93  
H3835020C WEST BEND 820 KART GASKET 10.93  
H3974016C 90'-91' MCCULLOCH MAC HEAD 7.66  
H3974020C 90'-91' MCCULLOCH MAC HEAD 7.78  
H3975050C 92' MCCULLOCH MAC HEAD        5.73  
EX1439050C MAC 91 EXHAUST                6.60  
EX1440050C MAC BENNETT SPEC EXHAUST 6.60  
EX1441050C MAC 92 EXHAUST                4.33  
EX1442050C WESTBEND 610 AND 820 EXHAUST 10.93  
H3978050C MAC 101 HEAD                7.33

[Vince Rosanelli]

Jeff, that's excellent, thank you for lead!

[Vince Rosanelli]

Jeff, if I may ask, are the kart gaskets listed under one of the individual categories on the Cometic website or do orders for them need to be phoned in?? I tried searching for them by the part number on the list you attached, and by searching the separate categories, but I didn't come across them. Thanks again for the info and prompt reply...

[steveohara]

I reuse the head bolts over and over until the hex is worn out. They are only torqued to 70 inch pounds so they will never stretch...... unless you lose a rod and the piston tries to blow the head off the motor! LOL
I reuse the copper head gaskets on the 92 and 101 models and always resurface them. On the 92 you have to keep an eye on the overall thickness for two reasons... one is you don't want to let the squish clearance get below .015" and two, the step on the top of the blocks on some 92s is close to the same dimension as the thickness of the gasket so if you keep shaving a thou or two off resurfacing each rebuild the gasket may get to the point where it is not standing up above the edge of the countersink in the top of the block.
Steve O'Hara

[Gary Wlodarsky]

Cometic Gaskets ...

440 354 0777

[doug tenney]

(Great thread.  My son picked up a Mc92, so relevant for me now.  I love Jeff Brown's replies.  Always helpful.  No wasted words. Thanks!)