340lc and 440 lc restore and rebuild

[Sticks]

let me know when your going to be ready to build one of my engines,

[red19lite]

i tolk appart a 76 440 motor with 77 clyinders with 77 piston the picture shows how not to do it, it can be done but the correct thrust washers are needed,, they are wider becuase the 76 rod is narrower, this picture shows the problem i have more on this later

[red19lite]

this jug came off the motor with the wrong thrust washers in, check out how they machined a oring around bore then all the way around outside of water jacket then they filled it with epoxy weird!

[Ruppsforever]

Great stuff man !!! Maybe the O-rings didn't work so well so they reverted back to the stock gaskets ?? Coolant might of seeped up the studs to the top of the head ?? Hey , can you PM me your phone number ?? I have a few questions about the pistons that your making. Thanks

[Sticks]

that's all they use in my Cat sno pro! I have changed the heads a couple of times and reused the same o-rings! never leaks.

[red19lite]

here a shot at the different thrust washer combinations on 76 440 crank, the left side is set up for 77 pistons the wrist pin width is 1.004 the stack width on bearing and thrust washeris .982 thats .022 clearance on the top of the rod this keeps the connecting rod centered up on the bottom end. stock 76 piston were .878 the stack on bearing a thrust washer .963 thats .015 clearance. there were some early wiseco piston at pin width .900 and some that came with there own thrust washers . probally the perfered clearance for thrust washer on the top end .015 to .030 this covers the 76 rods. the 77-78 motors have wider rods on the top but smaller od bearings for wrist pins . i will do the 77-78 combinations later

[red19lite]

here the new long awaited pistons weighed 4 +.020 pistons all weights came in the same at 214.1 for the piston bare real easy to balance that way and match both pistons, these are the most precision wiseco,s ive seen

[red19lite]

here another picture of the new batch of pistons, they have pin oiling, keystone barrel faced rings .059 thick they will last longer and use a larger ring retaining pin they have been lightened some but not a out, the pin bosses are milled equal for better rod alinement, measure some of the old wisecos from inside the pin boss to the outside of the piston i have seen as much as .050 difference that makes the connecting rod bind while engines running and more friction on bearings. these are precision parts they have a different port window that makes the skirts stronger

[red19lite]

here the pistons are hung on the rods now i got to get the clyinders ;D finished

[mrrupp1]

Do the new pistons make more horsepower right out of the box? Clint

[red19lite]

the new pistons should make more hp from lighter weight ,nicer ring package, better clyinder fit and rod alinment, i dont have a dyno to verifly, i am just a good machinest and know whats been available for these engines in the last five years these are the best strongest available now, you can still burn one down if other things arent right, these are the best wiseco piston i ever had for the 77-78 xenoahs follow the thread i share some more tips to get your engine right

[red19lite]

here s one of the 77 440 cylinders i will be using on my trail beater it has been line bored to .002 of finish size the ports have been chamfered{raduis edges} so rings dont stang ports, i am allowing .0045 clearance, measure the largest diameter of both piston 90 degrees the wrist pin,, my final bore size will be 2.6975 ,the new wiseco,s are very precise after the cylinders are final honed allways chech ring end gap . put a new ring in the top of the clyinder and square it up in the bore above the exhaust port minimum gap is .012 mine ended up about.015

[red19lite]

here the clyinders on the hone with torque plates installed, they are honed to size will sunnen 280 keyway type stones once there to size, i drop a brush hone thru about ten stroke cuts no metal but lays all fractures down give quicker break in and uses less ring up as it seats in and brings the ra down smoother, out of round and taper is with in.0002 after final honing after the ruff bored clyinders wer all torque to the torque plates i dial bored the clyinder both were .0003 to .0005 tighter on the top side of the clyinder i think the troque plates were wurth the time ,

[red19lite]

heres the finished clylnders always wash out with hot soapy water after honing, then i like to spray drep creep by sea foam on them a wipe with clean rags til you have no grey residue

[red19lite]

here jugs going on , maqke sure to check end gaps on rings and compress ring around retaining pin for ring before you compress ring to install piston and ring to cylinder you can do it with out a ring compressor just compres ring with yours finger in the transfer area and gently rock clyinder, you shouldnt have to force anything watch th e ring end gap when it goes thru the intake port, some time they snag a littlejust go slow putting the clyinder on

[red19lite]

got her all buttoned up,troque head t o15 ft lbs start in center at lower rate and criscross to outside in about three steps, run engine in thru heat cylce and retroque again i used winderosa gaskets but i like cometic better, troque clyinder to 24 ft lbs, clean all your treads and chamfer all threaded bolt holes first youll get a better seal they all raise a little since they are tapped to the surface from new, you can use a little gasket sealer on the base gasket if you like, the oringnal head gaskets zenoah used a littlle white colored sealer around the water jackets, i use a very thin coat of three bond sealer from liquid cooled kawasaki engine

[red19lite]

got it all together decided i wanted to protect all the bead blasted alluminum so i took it back apart, sprayed duplicolor clear engine paint on it, if you do this make sure you use all duplicoler paint it will lift vth paint i almost screwed up good think i tried spraying the clear on a small part before i did the whole engine the red i used was vht and it lifted so i masked it off the red befor i cleared it

[red19lite]

heres how it turned out hope it holds up well, later

[red19lite]

here my trail beater with old engine in its got one xenoah piston in it and a wiseco with Lring in the other side with broke ring retaining pin the end gap is in the exhaust port boy it still ran but i stopped last spring before it had major trouble i bought the sled used last fall just clean carbs rebuit fuel pump and fixed a few things on it its got a artic cat track and suspension out of a pantera under it

[red19lite]

here it is with the rebuilt engine from the thread just fired it today, swaped motors out put new motor mounts under it, fixed the cooling system the bumper wasnt hooked up it had a hole in it had to swap it out too, the acrtic suspension was missing ider wheel in the front of the slides and i added for more wheels to the slide rails, its got the wrong tach in it , the s peedo drive short shaft is missing its coming along need to get most of the small mechiancal things fixed this year then tear it a down and restore it an these things getta lot of little fixs that dont get done on them when there 35 years old a takes time and money and detrimination, there alot of you guy thats got some great restored rupp sleds out there i hope to get mine ther soon