2
210061741
Guest
Iv'e been rebuilding a PK-80 that someone sent me.
It was siezed up and wouldn't turn over.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11211.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11210.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11189.jpg
Here's what i found.
A large amount of metal dust behind the clutch and around the countershaft bearing housing.
Take a look.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11177.jpg
Initially you would expect that the bearing spun in the housing.
In fact it didn't.
All that metal was from the clutch cover.
http://i887.photobucket.com/albums/ac72/RidingRich/CAUSEOFDUST.jpg
The 3 guide pins on the clutch assembly and the star nut were wearing through the clutch cover.
I have noticide this on a few of the PK engines.
After further dissassembly of the engine i could easily determine the real cause of the failure.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11198.jpg
The wristpin needle bearing was severly damaged.
Several needles were broken to pcs.
You can see the needle fragments and severe damage to the wristpin as well.
Deep gouges around the pin where it broke in half.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11197.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11199.jpg
After the needle bearing failed it caused extreme loads on the wristpin and got very hot.
The wristpin was snapped into 2 pcs after the bosses inside the piston fragmented due to the extreme heat.
You can see the fragments from the piston and it is also cracked on both sides from the skirt to the piston dome.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11200.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11202.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11203.jpg
You can see the top of the boss is gone.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11209.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11208.jpg
The good thing here is this is all easy to fix.
I have a new piston, Wristpin, And Needle Bearing for this engine.
I will be replacing all the gaskets and seals and also have a set of the Quality 6202 mainbearings. The engine Cases and Crank are in good shape as well as the rest of the engine. The cylinder has 1 minor scratch in it and is still usable.
However i will be replacing the cylinder with a ported cylinder.
I cut the transfer tunnels much larger to help with flow and produce higher power.
The exhaust port it cut a bit larger and the intake is substancially dropped.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11183.jpg
This engine will soon be going back to it's owner who will be using it with a shift kit and a nexus hub.
Cant wait to see what he gets out of it.
BBBBRRRRRRRRR BBBBRRRRRRRR VVVrrrroooommmmmm
It was siezed up and wouldn't turn over.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11211.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11210.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11189.jpg
Here's what i found.
A large amount of metal dust behind the clutch and around the countershaft bearing housing.
Take a look.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11177.jpg
Initially you would expect that the bearing spun in the housing.
In fact it didn't.
All that metal was from the clutch cover.
http://i887.photobucket.com/albums/ac72/RidingRich/CAUSEOFDUST.jpg
The 3 guide pins on the clutch assembly and the star nut were wearing through the clutch cover.
I have noticide this on a few of the PK engines.
After further dissassembly of the engine i could easily determine the real cause of the failure.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11198.jpg
The wristpin needle bearing was severly damaged.
Several needles were broken to pcs.
You can see the needle fragments and severe damage to the wristpin as well.
Deep gouges around the pin where it broke in half.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11197.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11199.jpg
After the needle bearing failed it caused extreme loads on the wristpin and got very hot.
The wristpin was snapped into 2 pcs after the bosses inside the piston fragmented due to the extreme heat.
You can see the fragments from the piston and it is also cracked on both sides from the skirt to the piston dome.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11200.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11202.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11203.jpg
You can see the top of the boss is gone.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11209.jpg
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11208.jpg
The good thing here is this is all easy to fix.
I have a new piston, Wristpin, And Needle Bearing for this engine.
I will be replacing all the gaskets and seals and also have a set of the Quality 6202 mainbearings. The engine Cases and Crank are in good shape as well as the rest of the engine. The cylinder has 1 minor scratch in it and is still usable.
However i will be replacing the cylinder with a ported cylinder.
I cut the transfer tunnels much larger to help with flow and produce higher power.
The exhaust port it cut a bit larger and the intake is substancially dropped.
http://i887.photobucket.com/albums/ac72/RidingRich/SDC11183.jpg
This engine will soon be going back to it's owner who will be using it with a shift kit and a nexus hub.
Cant wait to see what he gets out of it.
BBBBRRRRRRRRR BBBBRRRRRRRR VVVrrrroooommmmmm