2ltr Aircooled engine knocking

[MOLEMAN]

Hi just installed a second hand engine ,I got it running without the airbox connected ,switched it of then connected the airbox and started her up ,now see sounds like a tractor .does anyone know what the problem could be ,cheers lee

[sarran1955]

Hello,

I'm very sorry........

But my crystal ball in in for re polishing.

Please go into a little more detail, type of engine....

What did it replace....

What was done to the donor engine before fitting....

Little details like that

A few photos , or even a video is good,

Cordialement,

[MOLEMAN]

sorry
its a cj coded engine.

it replaced a 1600 ct engine (rubbish).

nothing was done to the donor it was put staight in as it was .

sorry for the lack of info as never worked on engine's much ,trying to muddle through as on a very tight budget ,
so trying to do the work myself

cheers lee

[Dazco]

Did it sound ok without the airbox connected.

[MOLEMAN]

hi
yes it sounded ok .i put the airbox on and started her up and she sounded crap and there after with or without the air box
cheers lee

[82JEW75]

Got oil?

Got oil pressure?


Might sound like stating the obvious, but that's where I'd start.

[faggie]

did you put the airbox on straightaway after it was run , or did you leave it overnight then fit the airbox if its the latter its probably a lazy hydraulic lifter what just needs the engine running longer to build up pressure in the hydraulic tappet

[988mick]

it might be your carb popping,my carbs were back firing a small bit and it sounded like she was knocking.check for air leaks.if any of the vac hoses are old replace them and if its twin carbs it might need to be balanced otherwise might be a bit of piston slap.

[john1]

did you put the airbox on straightaway after it was run , or did you leave it overnight then fit the airbox if its the latter its probably a lazy hydraulic lifter what just needs the engine running longer to build up pressure in the hydraulic tappet

If its this a wee drive will get the pressure up, worked for me.

[fullsunian]

Tappet rattle, especially if its stood for a long time....cross your fingers and run it up should stop after a while but could take a good while