Limbach VW engine quirc

[Lars[_2_]]

Hi all!
It's been a while since I visited this group, I've been busy putting a
Scotish Aviation Bulldog on civilian register with a group of people
at the Swedish Air Force Museum. But now a friend of mine visited a
cousin in the US and whent on an airboat ride in the Everglades and
that hooked him so he has decided on building an airboat for himself.
Got the plans and everything and was looking for a suitable engine. I
happend to know a guy who swapped his VW for a Rotax in his Jodel D18,
so I called him to hear where his engine went but it was sold. The
flying club however had no less than two Limbachs lying around, one
aledgedly working that came out of a motor glider (also converted to
Rotax) and the other one with a crooked cranc shaft after a prop
strike. He got both at a bargain, but now we are puzzled because none
of the engines can be turned. Tops are off as well as magnetos and
fuel pump, but something clanks after approx. 340 degress of rotation.
Turning it forward it stops some way past TDC for the front cylinders
and turning it backwards is stops immediatley after TDC of the rear
cylinders, so it is not the pistons getting caught. If it was
something with the valve lifters I would have assumed that it would
get caught at close to 720 degrees, not close to 360 degrees, since
the cam shaft rotates at half the cranc shaft speed.

Most likley we are missing something obvious, so please feel free to
have a laugh at our ignorance, if only you can point out what we are
not thinking about!

Thanks!
/Lars

P.S. Remove the obvious from the email address if you want to mail me
directly. D.S.

[Lars[_2_]]

On 13 Aug, 18:53, Lars > wrote:
> Hi all!
> It's been a while since I visited this group, I've been busy putting a
> Scotish Aviation Bulldog on civilian register with a group of people
> at the Swedish Air Force Museum. But now a friend of mine visited a
> cousin in the US and whent on an airboat ride in the Everglades and
> that hooked him so he has decided on building an airboat for himself.
> Got the plans and everything and was looking for a suitable engine. I
> happend to know a guy who swapped his VW for a Rotax in his Jodel D18,
> so I called him to hear where his engine went but it was sold. The
> flying club however had no less than two Limbachs lying around, one
> aledgedly working that came out of a motor glider (also converted to
> Rotax) and the other one with a crooked cranc shaft after a prop
> strike. He got both at a bargain, but now we are puzzled because none
> of the engines can be turned. Tops are off as well as magnetos and
> fuel pump, but something clanks after approx. 340 degress of rotation.
> Turning it forward it stops some way past TDC for the front cylinders
> and turning it backwards is stops immediatley after TDC of the rear
> cylinders, so it is not the pistons getting caught. If it was
> something with the valve lifters I would have assumed that it would
> get caught at close to 720 degrees, not close to 360 degrees, since
> the cam shaft rotates at half the cranc shaft speed.
>
> Most likley we are missing something obvious, so please feel free to
> have a laugh at our ignorance, if only you can point out what we are
> not thinking about!
>
> Thanks!
> /Lars
>
> P.S. Remove the obvious from the email address if you want to mail me
> directly. D.S.

Hi again!
No reply, perhaps no surprise. Anyway, the engine is now completely
dismantled and nothing was found. In the process, the stop disappeared
after removing the oil pump. The obvious theory would have been
something caught in the drive train but no foreign objects where ever
found. I guess we will never know. The engine got a complete
inspection, the case will be painted bright red and hopefully it will
be on the waters, annoying the crowds, by next summer!

/Lars

[David E. Powell]

On Sep 6, 2:37*am, Lars > wrote:
> On 13 Aug, 18:53, Lars > wrote:
>
>
>
>
>
> > Hi all!
> > It's been a while since I visited this group, I've been busy putting a
> > Scotish Aviation Bulldog on civilian register with a group of people
> > at the Swedish Air Force Museum. But now a friend of mine visited a
> > cousin in the US and whent on an airboat ride in the Everglades and
> > that hooked him so he has decided on building an airboat for himself.
> > Got the plans and everything and was looking for a suitable engine. I
> > happend to know a guy who swapped his VW for a Rotax in his Jodel D18,
> > so I called him to hear where his engine went but it was sold. The
> > flying club however had no less than two Limbachs lying around, one
> > aledgedly working that came out of a motor glider (also converted to
> > Rotax) and the other one with a crooked cranc shaft after a prop
> > strike. He got both at a bargain, but now we are puzzled because none
> > of the engines can be turned. Tops are off as well as magnetos and
> > fuel pump, but something clanks after approx. 340 degress of rotation.
> > Turning it forward it stops some way past TDC for the front cylinders
> > and turning it backwards is stops immediatley after TDC of the rear
> > cylinders, so it is not the pistons getting caught. If it was
> > something with the valve lifters I would have assumed that it would
> > get caught at close to 720 degrees, not close to 360 degrees, since
> > the cam shaft rotates at half the cranc shaft speed.
>
> > Most likley we are missing something obvious, so please feel free to
> > have a laugh at our ignorance, if only you can point out what we are
> > not thinking about!
>
> > Thanks!
> > /Lars
>
> > P.S. Remove the obvious from the email address if you want to mail me
> > directly. D.S.
>
> Hi again!
> No reply, perhaps no surprise. Anyway, the engine is now completely
> dismantled and nothing was found. In the process, the stop disappeared
> after removing the oil pump. The obvious theory would have been
> something caught in the drive train but no foreign objects where ever
> found. I guess we will never know. The engine got a complete
> inspection, the case will be painted bright red and hopefully it will
> be on the waters, annoying the crowds, by next summer!
>
> /Lars

Congrats, I hope you have a blast, Airboats are fun as all!

[wesley marceaux[_2_]]

Mr Lars/
I sure wish I could trade you my 0-320 lyc. for your two
limbach engines..If your in the lower U.S. get back to me and maybe we could
do some business.
150H.P. will do allot for an AirBoat..
Cajun Wes
"Lars" > wrote in message
...
> On 13 Aug, 18:53, Lars > wrote:
>> Hi all!
>> It's been a while since I visited this group, I've been busy putting a
>> Scotish Aviation Bulldog on civilian register with a group of people
>> at the Swedish Air Force Museum. But now a friend of mine visited a
>> cousin in the US and whent on an airboat ride in the Everglades and
>> that hooked him so he has decided on building an airboat for himself.
>> Got the plans and everything and was looking for a suitable engine. I
>> happend to know a guy who swapped his VW for a Rotax in his Jodel D18,
>> so I called him to hear where his engine went but it was sold. The
>> flying club however had no less than two Limbachs lying around, one
>> aledgedly working that came out of a motor glider (also converted to
>> Rotax) and the other one with a crooked cranc shaft after a prop
>> strike. He got both at a bargain, but now we are puzzled because none
>> of the engines can be turned. Tops are off as well as magnetos and
>> fuel pump, but something clanks after approx. 340 degress of rotation.
>> Turning it forward it stops some way past TDC for the front cylinders
>> and turning it backwards is stops immediatley after TDC of the rear
>> cylinders, so it is not the pistons getting caught. If it was
>> something with the valve lifters I would have assumed that it would
>> get caught at close to 720 degrees, not close to 360 degrees, since
>> the cam shaft rotates at half the cranc shaft speed.
>>
>> Most likley we are missing something obvious, so please feel free to
>> have a laugh at our ignorance, if only you can point out what we are
>> not thinking about!
>>
>> Thanks!
>> /Lars
>>
>> P.S. Remove the obvious from the email address if you want to mail me
>> directly. D.S.
>
> Hi again!
> No reply, perhaps no surprise. Anyway, the engine is now completely
> dismantled and nothing was found. In the process, the stop disappeared
> after removing the oil pump. The obvious theory would have been
> something caught in the drive train but no foreign objects where ever
> found. I guess we will never know. The engine got a complete
> inspection, the case will be painted bright red and hopefully it will
> be on the waters, annoying the crowds, by next summer!
>
> /Lars