Troubleshooting a knocking engine

[Dumbledorbin]

Hi all. My engine is knocking. Doesnt sound like bottom end. I replaced cam followers on the weekend and they were indeed very stiff and stuck. However got it all abck up and running and its still knocking. If i take the piston 4 pushrods out the knocking stops completely. Any ideas what it could be? Worn cam? Rocker arm?

[Galileo]

1500 or 1300, Knock or tap, dull or bright sounding?

[Dumbledorbin]

Sorry. 1300 more of a tap. Quite a bright sound

[Dumbledorbin]

Sorry. 1300 more of a tap. Quite a bright sound

[Jon Tilson]

OHV's do suffer rocket shaft wear and if the noise goes with the pushrods out then that really points to that.

Jonners

[Dumbledorbin]

Is there a way of checking it for rocker shaft wear? or am i best off just replacing the rocker shaft to find out?

[Dumbledorbin]

Took the head off. Looks like piston 4 is hitting the cylinder head. So possible small end or crack in the piston? Either way the engines coming out. I have 4 pistons lying around here. How do i know if they are the correct size? Is it the number stamped G? The ones in the block are all stamped G have a long number of 213719 and underneath that it says t25.

The ones i have lying around are the same but underneath the long number it says s44.

Will these fit?

[zombeh]

The long number is the part number and the G is the size so if they're the same they should fit as well as the old one.

[Dumbledorbin]

Happy days. Hopefully have it rebuilt on the weekend. Cheers

[Carledo]

Be sure to check the gudgeon pin fit in the small end bush in the conrod, if there is play here you will still have the same problem on re-assembly.

Steve

[Dumbledorbin]

I have new conrods, shells, pistons, so should hopefully be perfect when all back together. welders also coming out to play this weekend. hopefully have everything welded and engine running by 12th of next month for MOT. fingers crossed.