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Post by shamrockexpress on Apr 19, 2008 23:18:09 GMT
when installing crank and closeing up cases do you mount the two large bearings on the crank first put it in the freezer then gently heat cases to get a push fit,,,,,,,, if you have done simlar i would like to know the correct order to put them back to gether, thanx.  |
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Post by shamrockexpress on Apr 21, 2008 13:39:42 GMT
WITH ALL ENGINEERING SPECIALIST IN HERE SOME ONE IS BOUND TO BE ABLE TO GIVE A LITTLE DIRECTION,,,,,,,,,,,,,,,,its not long until christmas boys and have a few of them parma kit to give to my best friends who really are help full so TALK OR THE KIDS GET THEM!!!!!!!! ;D
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Post by shamrockexpress on Aug 24, 2008 20:44:19 GMT
when installing crank and closeing up cases do you mount the two large bearings on the crank first put it in the freezer then gently heat cases to get a push fit,,,,,,,, if you have done simlar i would like to know the correct order to put them back to gether, thanx. I,ll try again,,,,,,anyone no the correct order to reassemble the crank-bearings and seals without any pushing or hammering,,,,,,,,any info would be much appreciated as i want to get this off the bench and my smallie ready for a PARMA ;D |
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Post by breezer on Aug 24, 2008 21:09:57 GMT
I put the bearings in the case then pulled the crank into the casings using the threads on the crank. Well I did one side like that - after Martin at Chislespeed did the other and told me how to do it!  |
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Post by tony on Aug 24, 2008 23:21:50 GMT
Falc system is similar with a special tool to pull the halves together as jim says.
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Post by breezer on Aug 25, 2008 8:16:32 GMT
Martin also said he would normally fit the flywheel bearing to the crank, the other to the case, fit the crank to the main casing, then heat the flyside and slide that on.
I'm not keen on heating anything though, bearings or cases, primarily because I never heat them hot enough then it doesn't work.
When I fitted bearins to my cases they tapped in lovely, without heating or freezing anything, and pulling them in was fine as well, so it seems to be the way to go for me!
that was on a smallframe though, dunno if it's possible on large frame as clutch is in different place
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Post by shamrockexpress on Aug 25, 2008 8:56:50 GMT
First of all thanx breezer and tony for your help! I take on board what yous are saying, i have looked at old manuals and after attempting a few of these rebuilds there seems to be no easy way to close the cases without applying pressure. It makes sense to pull the crank thru the clutch side bearing which is easily done when the seal is on the inside (like p-range motors) but on the gs its on the outside hence covering the inner race where you need to pull against with the crank. The only way i can see to do this is to press bearings on to either side of crank and freeze it (with two bearings on) Heat main casing as hot as possible, slip seal in, and with wedge between crank halves hopefully push fit/tap home bearing and crank into brass insert. Flywheel side alot of heat and using longer crankcase bolts pull cases together. I would love to know how the piaggio factory and dealers of the 60s went about this job they must have had quite alot to do so probably had it down to a fine art. WOULD APPRECIATE ANY BODYS THOUGHTS ON WHAT I AM PROPOSING TO DO. i have already destroyed two bearings and two seals, so hoping for third time lucky. cheers Damian  |
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Post by breezer on Aug 25, 2008 9:46:41 GMT
What does the haynes manual say? The pale blue one?
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Post by shamrockexpress on Aug 25, 2008 10:36:59 GMT
What does the haynes manual say? The pale blue one? Good point ....have just checked and detail isnt very good but going by the pictures it looks like the method i described as it shows a pic of the crank being inserted with bearings on,,,,,,,,,,,,,so it looks like its the way to go..... will let you know the results, cheers. |
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Post by tony on Aug 25, 2008 11:10:53 GMT
damien, hold on!
Fit fly brg to crank.
Fit seal and brg to clutch side, use clutch and nut (spacer and nut maybe at first) to draw crank in that side.
Then heat the crankcase fly side and push it on. You could get a piece of tube-(bigger diameter that hole on casing), weld washer on end and fit over taper on crank. Use the fly nut to draw on the casing.
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Post by shamrockexpress on Aug 25, 2008 13:59:26 GMT
damien, hold on! Fit fly brg to crank. Fit seal and brg to clutch side, use clutch and nut (spacer and nut maybe at first) to draw crank in that side. Then heat the crankcase fly side and push it on. You could get a piece of tube-(bigger diameter that hole on casing), weld washer on end and fit over taper on crank. Use the fly nut to draw on the casing. Tony by doing what you say means that crank is being pushed and pulled with no support to inner race on bearing due to seal covering the race. Do you not think this would be putting unnesacary pressure on center of bearings? |
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Post by tony on Aug 25, 2008 22:47:49 GMT
not sure what you mean mate,
can you post up a pic of crank, brgs and seals. I need a memory refresh!
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Post by shamrockexpress on Aug 26, 2008 22:43:02 GMT
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Post by tony on Aug 27, 2008 0:32:23 GMT
hi mate and cheers..
This is what i would do. Fit seals and brgs to case.. then using the threads on the crank i would make up a tool for either side to draw the crank in.
Tool would be a piece of tube wide enough to go over the casing and with a penny washer on the end (weld if pos) and use the nut from either side to draw it home
Do fly side first then offer up the whole side and do the same with other side.
What you must then do is make sure the brgs arent 'loaded' in a horizontal plane. You will feel this by turning the crank. If they are then gently tap with copper mallet to un load.
This system is what guru lauro falc cafforio uses so it cant be that bad.
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Post by shamrockexpress on Aug 27, 2008 20:19:44 GMT
After considering all possibilities i think what you said is probably best so i,ll give it a try this weekend,
PS if you happen to be chatting to SENIOR LAURO FALC you can tell him the irish build their engines just like him,,,,,,,,,,,and if he or yourself want a working holiday in Ireland my garage door is always open CEAD MILE FAILTIE ;D
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Post by tony on Aug 27, 2008 22:59:52 GMT
is that a thousand million welcomes?!!!
Or beers?
I'll have a word with the man! ;D
Good luck... if crank is too tight in brgs you could lap it down a little mate..
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Post by soosh on Nov 8, 2008 15:07:40 GMT
Just got my GS 150 back on the road,had a centerplug head done for it to make it more practical for modern traffic.Got a different needle done for the old carb.Got it up to nearly 11hp but rides aswel as a poor p200 or a good px150.Was well worth getting it done.Jerome at Readspeed sorted it.
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Post by 225worb on Nov 8, 2008 19:49:39 GMT
::)Why does a central plug do for traffik riding ..... ;)Breadwin
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Post by soosh on Nov 16, 2008 16:55:31 GMT
means you can keep up with it you homo!!
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Post by 225worb on Nov 16, 2008 20:02:20 GMT
Wow ' Rusty' a centre plug helps you keep up wth the traffic ....New one on me ...Hasnt seen any traffic ....Riding it helps  |
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