Shattered Piston, Cases, Rod

[SkiDaddy]

After a good solid 2 tanks of waist to chest waves at Ponce yesterday my ski suddenly died when landing from a medium wave. I'm thinking the battery cable or something as it would click but not turn over.

Here's what I found. :bigeyes::aargh4::aargh4::aargh4::aargh4::aargh4::aargh4::17::17::17: Looks like jetting & lubrication was nominal, ski was running great all day, hitting hard. Looks like the wimpy cast piston just shattered. All bearings look fine, no evidence of water ingestion.

I think with resleeving the excellent porting can be saved. Anybody know if the slight bulging can be addressed?

 

[DAG]

odd,
how long have you been running that cylinder/piston combo?
maby the tolerances were to tight, or compression to high, or bad luck and a defected crank

but look on the good side, the other end of teh rod dident go smashing through your case and through your hull o_0

 

[SkiDaddy]

I think I've had that top end a little under a year. I pulled the cylinder off a couple months ago & didn't see any cracks....:splatt:

 

[#ZERO]

Ouch... it looks like you're getting pretty bad a blowing stuff up too.

My guess would be that the rod broke first and toke out the piston skirt.

Who rebuilt that crank? :scratchchin:

 

[SkiDaddy]

Brand new Hot Rods, maybe 10 months old. NO rust on any bearings.

 

[#ZERO]

Brand new Hot Rods, maybe 10 months old. NO rust on any bearings.

Are you sure that a Hot Rods crank because the lower rod journal looks to be trimmed down?

Maybe it's just from hitting debris inside the case. :thinking:

 

[SkiDaddy]

Are you sure that a Hot Rods crank because the lower rod journal looks to be trimmed down?

Maybe it's just from hitting debris inside the case. :thinking:

It was purchased brand new & came in a Hot Rods box...

Are you talking about the same end machining visible on the "good" cylinder?

 

[#ZERO]

I just went to check my own hot rods crank and I guess it's normal for them to turn the end of the rods down.

For some reason I always thought that the hot rods were more rounded on the bottom journal.

 

[SUPERJET-113]

"As the cast crumbles":banghead: Thats why i hate cast pistons....

 

[vomitspot]

this isnt the 1st hot rod ive seen break
the last one took out the case and the starter and the cylinder

 

[yamaslut]

this isnt the 1st hot rod ive seen break
the last one took out the case and the starter and the cylinder

I had one fail after a couple months....
in mine the mid bearing went to crap

 

[WDKfan]

Almost the same thing happened to me a couple weeks ago:banghead::banghead:

 

[SkiDaddy]

If you look at the busted rod you can see it snapped clean in tension; looks like the piston shattered, jamming in the cylinder & the crank kept spinning, pulling the rod in half. So I wouldn't think it was a crank failure.

Damage amounts to new cases, crank, pistons, cylinders, and domes. Resleeving the damaged cylinder would take prolly 6 weeks? & cost $$$$$$$$

Anybody have a stock, low hour short block FS?

 

[yamaslut]

If you look at the busted rod you can see it snapped clean in tension; looks like the piston shattered, jamming in the cylinder & the crank kept spinning, pulling the rod in half. So I wouldn't think it was a crank failure.

Damage amounts to new cases, crank, pistons, cylinders, and domes. Resleeving the damaged cylinder would take prolly 6 weeks? & cost $$$$$$$$

Anybody have a stock, low hour short block FS?

ever thought of kayaking?????

 

[SkiDaddy]

What was that Kayak w/the single cylinder engine?:cool2: