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cj6 gearbox

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Jacquescj6

Joined: 20 Dec 2011
Posts: 23
Location: Swakopmund , Namibia

Posted: Wed Aug 09, 2017 7:42 am Post subject: cj6 gearbox

Hi 

I want to change a reduction gearbox on a cj6 engine. Has anybody done this and if so how difficult would it be.

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wlannon(at)shaw.ca
Guest

Posted: Wed Aug 09, 2017 8:47 am Post subject: cj6 gearbox

Hi Jacques;



May I ask why?



Walt



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Jacquescj6

Joined: 20 Dec 2011
Posts: 23
Location: Swakopmund , Namibia

Posted: Wed Aug 09, 2017 9:39 am Post subject: Re: cj6 gearbox

Hi Walt

My current engine crankcase developed a crack.

I have an spare engine that i can replace it with that had a prop strike with a hanger door.

I have been told that I can use that engine but would just feel better if I replace the gearbox

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richard.goode(at)russiana
Guest

Posted: Wed Aug 09, 2017 8:13 pm Post subject: cj6 gearbox

My strong advice is that the gearbox should be shock-load tested after

anything more than a very moderate ground-strike – and this is particularly

true with the metal propeller.



Richard Goode



Rhodds Farm 

Lyonshall 

Hereford 

HR5 3LW 

United Kingdom 

 Tel: +94 (0) 81 241 5137 (Sri Lanka)

Tel:   +44 (0) 1544 340120 

Fax:  +44 (0) 1544 340129 

www.russianaeros.com

I’m currently in Sri Lanka but this Mail is working,and my local phone is

+94 779 132 160.



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Jacquescj6

Joined: 20 Dec 2011
Posts: 23
Location: Swakopmund , Namibia

Posted: Thu Aug 10, 2017 7:15 am Post subject: Re: cj6 gearbox

I agree with you Richard that is why I would rather want to change out the gearbox of the engine that had the prop strike.

Just wanted to know if it is a big job and if there is anything I need to be on the look out for.

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richard.goode(at)russiana
Guest

Posted: Thu Aug 10, 2017 7:46 am Post subject: cj6 gearbox

I can only speak for the Russian engines, but I have little doubt that the

Chinese engines, although many parts are different, are in practical terms

extremely similar, and from that point of view, changing the gearbox is

extremely simple.



Richard Goode



Rhodds Farm 

Lyonshall 

Hereford 

HR5 3LW 

United Kingdom 

 Tel: +94 (0) 81 241 5137 (Sri Lanka)

Tel:   +44 (0) 1544 340120 

Fax:  +44 (0) 1544 340129 

www.russianaeros.com

I’m currently in Sri Lanka but this Mail is working,and my local phone is

+94 779 132 160.



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mark.bitterlich(at)navy.m
Guest

Posted: Thu Aug 10, 2017 9:06 am Post subject: cj6 gearbox

For what it is worth, the Russian mechanics, and the Russian trained mechanics of the M-14 family that I have spoken with have told me to also check the timing on the engine after a prop strike.  Look for even the smallest amount of change.   This due to the fact that on the M-14,  the accessory drive shaft is very easy to "twist" due to the fact that it is spinning a lot of mass, and a sudden jerk can cause the shaft to twist thus changing the timing.  I don't know about the Housai but I suspect it is the same design.   If the timing has changed at all, a major inspection is called for.

Mark

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richard.goode(at)russiana
Guest

Posted: Thu Aug 10, 2017 8:07 pm Post subject: cj6 gearbox

Mark is absolutely correct – it is critical to check the magneto timing very

carefully after a ground-strike, since this will provide a very clear

indication of torsional damage to the supercharger drive. But what is most

likely to suffer are the satellite gears in the gearbox, so these really

should be crack tested.



Richard Goode



Rhodds Farm 

Lyonshall 

Hereford 

HR5 3LW 

United Kingdom 

 Tel: +94 (0) 81 241 5137 (Sri Lanka)

Tel:   +44 (0) 1544 340120 

Fax:  +44 (0) 1544 340129 

www.russianaeros.com

I’m currently in Sri Lanka but this Mail is working,and my local phone is

+94 779 132 160.



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Jacquescj6

Joined: 20 Dec 2011
Posts: 23
Location: Swakopmund , Namibia

Posted: Thu Aug 17, 2017 9:25 am Post subject: Re: cj6 gearbox

I have now replaced the gearbox. All timing were checked but on start the prop turns very slowly even with 45-50 pressure in system.

Turning the prop by hand feels ok.

If the pressure drops below 30 the prop does not turn.

Any ideas..

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