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Help please with Thunder Tiger GP42

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Mike T11/08/2020 14:12:36
553 forum posts
50 photos

Thanks Denis, but I'm referring to the seals between the fuel inlet banjo, the NVA and the carb body. The joint between the latter and the crankcase is leak-free.

Cliff Bastow11/08/2020 14:21:41
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916 forum posts
464 photos

The reason I need a head gasket is that the engine has developed a slight leak from under the head and on stripping down there is definitely no gasket present. I did not get the engine from new so I don't know its history.

It has been a very reliable engine for many years and I would like to keep it going if I can. The new gaskets arrived from the USA yesterday so good service there.

I don't mind if I loose a little power as it is more than powerful enough for the Cub it is fitted in, a lot of the time I am flying on about a third throttle anyway.

Cheers all Cliff.

Caveman11/08/2020 15:28:35
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308 forum posts
244 photos

There's a pdf here showing all the Thunder Tiger engines, including parts lists, exploded diagrams for engines, carbs etc.

Even if the parts are no longer available the exploded diagram show what should be there!

GDB

Cliff Bastow11/08/2020 16:00:19
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916 forum posts
464 photos

 

Thanks Caveman that is a great help. There should be a gasket then.

The guy I ordered from in the states makes replacement gaskets for loads of engines if anyone is in need.

https://www.ebay.co.uk/itm/Thunder-Tiger-GP-42-Cylinder-Head-Gasket-2-Pack-NIP/283484043260?hash=item4200f737fc:g:TU4AAOSwytBc2d-w

Edited By Cliff Bastow on 11/08/2020 16:02:28

Denis Watkins11/08/2020 16:24:47
4624 forum posts
129 photos
Posted by Mike T on 11/08/2020 14:12:36:

Thanks Denis, but I'm referring to the seals between the fuel inlet banjo, the NVA and the carb body. The joint between the latter and the crankcase is leak-free.

Mike, look at Cavemans excellent source

There are washers either end of the banjo

Doc Marten11/08/2020 21:59:42
693 forum posts
7 photos
Posted by Engine Doctor on 10/08/2020 19:41:01:

A new gasket/ shim can easily be cut from a small piece of annealed litho plate or as said earlier some aluminium pie case although it should be a thicker type like a ali baking tray . Use the line for a pattern and a scribe . Cut the center out with a scalpel then cut the outer with a pair of sharp scissors . Not bad engines for their day but took forever for the piston liner to fully run in .

making a head shim using this method has sorted a few four-strokes over the years that kept on throwing props.

I have an Enya 60 4c in a 2x Lady Bird That was unusable as it kep throwing the prop. I tried everything form different fuels to plugs and two washer under the plug etc to no avail . I then cut a shim from litho plate andthe engine is transformed with no loss of power .

So glad you posted this ED, I have a TT that needs a new head gasket and a stock of Litho plate, time to break out the Vernier gauge and circle cutter. yes

Mike T12/08/2020 13:24:26
553 forum posts
50 photos
Posted by Denis Watkins on 11/08/2020 16:24:47:
Posted by Mike T on 11/08/2020 14:12:36:

Thanks Denis, but I'm referring to the seals between the fuel inlet banjo, the NVA and the carb body. The joint between the latter and the crankcase is leak-free.

Mike, look at Cavemans excellent source

There are washers either end of the banjo

All I can see is the carb shown as a complete assembly. This goes for all the other 2S engines except the GP-07 which shows the parts separately, with no gaskets. Looks like I'll just have to hone the mating faces a bit more. Thanks Denis.

Denis Watkins12/08/2020 13:37:34
4624 forum posts
129 photos
Posted by Mike T on 12/08/2020 13:24:26:
Posted by Denis Watkins on 11/08/2020 16:24:47:
Posted by Mike T on 11/08/2020 14:12:36:

Thanks Denis, but I'm referring to the seals between the fuel inlet banjo, the NVA and the carb body. The joint between the latter and the crankcase is leak-free.

Mike, look at Cavemans excellent source

There are washers either end of the banjo

All I can see is the carb shown as a complete assembly. This goes for all the other 2S engines except the GP-07 which shows the parts separately, with no gaskets. Looks like I'll just have to hone the mating faces a bit more. Thanks Denis.

screenshot_2020-08-12-13-32-02.jpg

Caveman12/08/2020 13:38:02
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308 forum posts
244 photos

Mike T, scroll further down and you'll find the carbs exploded. The GP42 carb is on page 24

GDB

Mike T13/08/2020 12:11:50
553 forum posts
50 photos

Aha! Sub-optimal scrolling by me! Thanks for pointing that out.

Time to beak out the brass tube punches and the take-away containers!

 

Edited By Mike T on 13/08/2020 12:18:44

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