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well i think i seriouly f@#%ed up the pinz engine. big loss of power going up a long hill on the highway slowed to 60km started smoking lots so took the next exit and then it died. just starting to take it apart and noticed a good pool of oil in the rubber air intake boot and down the carbs not a good sign i think. motor is hard to turn over by hand using the fan with no plugs in and out of gear.valve ajustment is ok and a compression check well #1 30 #2 125 #3 150 #4 0 with the plugs looking like they were dipped in oil.i should say my compression tester is not the best for a good seal also but those # are not even close.well i think i'll start to take the carbs and shrouds off to get a better look if any thoughts would love to hear before i have a engine all in peaces and thinking of putting a 350 chevy into a pinz lol.

Sounds like air filter is dirty and you sucked oil down the carbs. Clean plugs. Change filter should start.

also base of carbs really wet on choke side.

Erik712m wrote:Sounds like air filter is dirty and you sucked oil down the carbs. Clean plugs. Change filter should start.

Don't think a dirty air filter would account for

compression check well #1 30 #2 125 #3 150 #4 0

little compression (30 psi) in #1 cylinder and 0 psi in #4. sounds like time to tear down the top end for an inspection and rebuild.
May want to rerun your compression test first just to be sure however from those compression figures all is not well.

Ed

Yeah Ed read the first three and saw one a 130 not 1 30.

Zero on cylinder four. Only way for that to be possible is piston didn't move.

well after a few cranks #1 was bouncing back was up to 90 but 4 was still 0 so i took it apart and found #4 to be missing the bottom of the piston so after 10,000 km on a rebuilt top and cylinders checked and honed and new pistons and rings not too happy.here are some pics to see if anyone else has come across this and to why it might happen. next i guess i'll pull the cyl and see if its ok i could put the old piston back in or maybe its time to see about the mb 2.9 diesel and how close it would be to install. normally a 350 chev goes into all my toyotas and vegas in the past.[/img]

I had the same symptoms happen to me on a chevy Blue Flame 6.
The cause was a small bolt that somehow got into a cylinder and
poked a hole in a piston on the up stroke...I have the old piston
somewhere and will post a pic if I find it...it has part of the bolt

inbedded in it. this was on the homeward bound portion of a 1200
mile trip and I was only 100 miles from home

So sorry to hear the bad news, I hope the heads look ok.
Am curious what brand pistons were used and if anyone we know did the rebuild?

Ed

It sure looks like a nut or bolt got sucked into that cylinder and beat a hole into the piston.

looks like all the screws are still all on the carb and don't remember dropping anything down there we had a good cold snap for a week -20 and she sure didn't want to start when she did it sure wasn't pretty.so now it looks like the cyl will have to be bored all the others are in nice shape but if i bore one i'll have to do all so looks like i'lll need new pistons again. i see swiss army vehicles has up to 93mm mine are already 92.5mm so i hope they can clean up the cyl with just .5 our is it worth just going for the 2.7 liter conversion.
this is one ugly looking piston

Have these guys make your pistons-
http://www.ariaspistons.com/
I've used their custom made pistons and would recommend looking into it. They will make a minimum of 4.

did you get them to up the compression ratio from 7.5

Paul nothing went into your piston the damage is from to much heat or timing to advanced sence the rings were not damaged one other thing that may have caused this is to lean fuel mixture caused to much heat. Swiss army has all the parts you need be sure to get the correct piston size and jug bore size.

Your piston failed due to 2 things, #1 leak at head to cylinder surfaces(notice black marks on heads and cylinder mating surfaces).
I do sell Arias pistons and can provide cylinder boring services.
You must also pull and inspect the camshaft bore plugs(most common top end failure)
If the bore plugs come loose you loose oil feed to the piston skirts.
I also offer a high torque cam(exchange required).
PM for pricing

Paul Gudmundson wrote: we had a good cold snap for a week -20 and she sure didn't want to start when she did it sure wasn't pretty.

Any chance starting fluid “ether” may have played a role in this?

Ed