Hay guys I need some help locating a head gasket set for a Magnum 108. I think this engine is out of production, but I got one that is in good shape but it is missing the head gaskets. the engine runs good but leaks around the head. when I checkd the leak I found there was no head gaskets. I have looked on line and have not been able to find any. any help would be great.

The bore is 28.58 mm or 1.125 in. Is the head gasket the standard "flat ring" that sits in a recess in the head, over a cylinder sleeve?

Some call these cylinder head shims. Is that what you're talking about?

An ASP108 has a 28.50 bore.
An OS 91 Fx &95 AX have a 1.09 in bore.
An OS120 AXhas 1.197 in. bore.

John gilmore
that is exactly what i am looking for

Hi

I was looking for a MVVS head gskt. An OS FP 40 head gskt was the same size. You might try an OS 1.08 head gskt. You can still get them.


This is a Replacement Gasket Set for the O.S. 108FSR(BX-1) Engine.

SPECS: Head Gasket:
I.D.:29.1(1.148")
O.D.:35.4(1.396")
Thick: 0.3(0.013")


http://www3.towerhobbies.com/cgi-bin...?&I=LXCM88&P=7




Vince

A sharp knife and some gasket paper....

altered1
I dont think gasket paper will work, I think it will be to thick. I think the original ones were some kind of metal, but I am not sure

I just replaced the "head gasket" / "shim" in a Magnum XLS 52. The shim is very thin metal - did I say very thin? You bat an eyelash and it will bend. Magnum being Magnum I would guess that it's the same technical approach.

Have you tried Just Engines in the UK? Good luck

Make them out of aluminum sheet you an get at a hobby shop or crafts shop. Not the best aluminum for the job but it will work. Myself I prefer to drink a beer and make them from the can. Again not the best aluminum but it will work.

Denis

I just made one for a diesel engine. Aluminium kitchen foil is too thin to seal, but two layers works fine. Disposable aluminium oven trays are great but I didn't have any. Then it hit me the foil pouch that I had just got my new #11 blade out of was perfect.

Or an adult fizzy drink can will work great as well.

Take the cylinder liner out of the engine and carefully hold the foil over the top end. Carefully cut around the inside with a scalpel or sharp modelling knife. Press around the outside edge with your fingers to mark the foil, then cut out with sharp scissors. You may need to make 3 or 4 before you get a nice one.


Are you sure it's missing? Sometimes they hide in the cylinder head and you have to carefully work them out with a pin. Don't slip and scratch it or bend it or you will need a new one anyway.

You need to be carefull about what thickness you end up using, too thin can let the piston hit the head, or can lead to detonation, overheating, blown plugs and engine damage. Too thick can lead to low power and the plug cooling off and the engine stopping. It all depends on how much nitro you are running, what propeller load, how much cooling the engine gets, etc. But if your engine runs fine now you should be fine with any of the aluminium thicknesses mentioned so far.

Daved H

Thanks every body, It looks like I get to improve my gasket making skills, I have been making my own exhaust gaskets so I guess a good bud and sharp razor knife is next (just one bud don't wont to cut myself).
again everybody thanks for your help.

Hi!
I make my own aluminium shims!
It's easy!
Just use a divider with a knife blade (there are small blades made especially for dividers).
I use 0.1mm pizza foil.
Put some masking tape where you intend to put the sharp divider point and slowly spin the divider round until you have a small indentation in the foil! But do not ! Do not! try to cut through the foil yet!!!!!!

Now ,when you have two ring formed indentatiions in the foil looking like a shim ...you just take the foil between your fingers and began wiggling it!....
After a while the shim will get loose from the rest of the foil! if not! Just keep wiggling untill it gets loose!!!!
It takes some practise to make the correct inner and outher shim diameter.But practice makes perfect!

Jaka
That is a great idea I had not thought about doing it that way but I do have the tools to do it. But wouldnt I want a thicker metal than 1mm I was thinking about something in the .013 range, I may be wrong my meteric is poor but isn't .013 quit abit thicker

Hey - you'll get additional compression.

If you are having troubles with the thin aluminum, you can ease the problems by using a contact cement like 3M 77 on to a small piece of wood. This will hold the aluminum steady on the wooden block as you cut it.