Husky 141 Rebuild - Aftermarket Piston Issue

[rhonddaboy]

Mmm... wish I had your advice before purchase. Anyway, 'compatible' aftermarket piston arrived - 40mm - problem now that piston top hits top of crancase slightly before tdc.  Just about to give up!  Heres a thought - can I add a crancase gasket (3mm will suffice cut from high temp gasket sheet) to give clearance at the same time ensuring minimum combustion volume? Thinking aloud - this may/will affect porting?  

[htb]

AFAIK, your engine is a clamshell design with top of crankcase being cast as one with the cyllinder. If you put gasket paper on the joint you shoed in previous page, the only thing you would achieve would be loose bearings and seals.

I stand to corrected.

@spudulike

[Macpherson]

You must mean that the new piston's hitting off the top of the cylinder just before tdc. not much to be done about that, it must be the wrong piston, compare it to the old one.

[adw]

What the hell have you purchased, I would send it back to where it came from, I just cannot think what they sent to you, the crank was the same for both 136 and 141, and even the 137 and 142, so it is just completely wrong, as a matter of interest where did it come from?

[adw]

39 minutes ago, htb said:

AFAIK, your engine is a clamshell design with top of crankcase being cast as one with the cyllinder. If you put gasket paper on the joint you shoed in previous page, the only thing you would achieve would be loose bearings and seals.

I stand to corrected.

@spudulike

You are quite correct.

[htb]

9 minutes ago, adw said:

You are quite correct.

Thanks, so I'm not loosing it yet...

[rhonddaboy]

The piston was an aftermarket Golf piston. There is a difference of c+3mm from the centre of the wrist pin to the top of the piston between OEM and aftermarket version from the supplier! I take the good and obvious point on paper gasket though.  Sensible option here to send it back.

[spudulike]

23 hours ago, htb said:

AFAIK, your engine is a clamshell design with top of crankcase being cast as one with the cyllinder. If you put gasket paper on the joint you shoed in previous page, the only thing you would achieve would be loose bearings and seals.

I stand to corrected.

@spudulike

You are totally correct as others have confirmed.

[spudulike]

Strange, Golf pistons are usually not that bad. Not used one for a long time but have in the past and they were generally OK.

If the crown to pin dim is +3mm out, it will never work.

[lurch_917]

On 30/03/2023 at 20:46, htb said:

Thanks, so I'm not loosing it yet...

no but you gotta head start on us ..😃