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« Reply #6150 on: May 27, 2013, 11:22:41 PM » |
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LIVE FAST and DIE YOUNG,, past 50 AND STILL HERE NOW. WAITING. FOR. THE. GRIM. REAPER
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Manky Monkey
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« Reply #6151 on: May 27, 2013, 11:27:13 PM » |
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 Can't really argue that it's a rat at the moment, but not the way I want it to stay. Everyone seems to like it in bare metal, but it'll be modern Fiat 500 green eventually.
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On the last freedom moped out of Nowhere City.
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« Reply #6152 on: May 27, 2013, 11:31:09 PM » |
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LIVE FAST and DIE YOUNG,, past 50 AND STILL HERE NOW. WAITING. FOR. THE. GRIM. REAPER
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Manky Monkey
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« Reply #6153 on: May 28, 2013, 07:42:14 PM » |
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Nipped over to Real Steel in Middlesex after work today & bought a new throttle cable & some rocker cover breathers to replace the one I sheared off last week. Pouring with rain here again today so couldn't work outside on the engine.
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On the last freedom moped out of Nowhere City.
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BikerGran
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Gran Turismo
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« Reply #6154 on: May 29, 2013, 06:20:49 PM » |
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Just been watching a fred Dibnah programme where he was travelling round Britain in the traction engine he built - he had to stop off somewhere to modify one of the the pistons! See, it's not just you!
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« Last Edit: May 29, 2013, 07:00:50 PM by Manky Monkey »
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You don't stop havin fun because you get old - you get old if you stop havin fun!
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Manky Monkey
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« Reply #6155 on: May 29, 2013, 07:06:17 PM » |
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 Lifted out the inlet manifold & carb today, then pulled the valley gasket to see what's been going on underneath. No visible damage anywhere, (bent pushrod dropped back in place to show where it came from. 4th from left).
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On the last freedom moped out of Nowhere City.
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Manky Monkey
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« Reply #6156 on: May 29, 2013, 07:13:22 PM » |
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No obvious signs of damage to the hydraulic lifter. Haven't checked it yet -I guess I should be able to push the inner piston down inside the outer casing with a screwdriver or whatever? If it's seized I can pull another from my spare engine.
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« Last Edit: May 29, 2013, 07:18:49 PM by Manky Monkey »
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Manky Monkey
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« Reply #6158 on: May 29, 2013, 07:19:43 PM » |
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Yeah, I know the cam's pretty worn,
The hydraulic lifter's sliding up & down nicely in it's casting.
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Manky Monkey
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« Reply #6159 on: May 29, 2013, 07:20:15 PM » |
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Manky Monkey
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« Reply #6160 on: May 29, 2013, 07:24:50 PM » |
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Rocker assembly. Gungey ain't it.
All the rockers turn & slide on the shaft with no problems.
The cups that the pushrods sit into are all shiney, except for the one with the bent pushrod, (4th from left), which looks grey, like it's had grinding paste in it, presumably from the rod trying to escape from it.
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On the last freedom moped out of Nowhere City.
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« Reply #6161 on: May 29, 2013, 07:30:54 PM » |
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its had a sticky valve at some time,,just check its not bent  |
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LIVE FAST and DIE YOUNG,, past 50 AND STILL HERE NOW. WAITING. FOR. THE. GRIM. REAPER
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scannerzer
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« Reply #6162 on: May 29, 2013, 07:32:10 PM » |
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could you get like a 4.0l from a range rover and swap your carb and dizzy for it's injection system,bigger capacity and more modern
in 1 fell swoop
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Manky Monkey
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« Reply #6163 on: May 29, 2013, 07:35:49 PM » |
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The valve moves cleanly up & down when we push against it Mike. If it was bent I assume it'd stick down? The valve spring seems O.K too.
Apart from this pushrod problem, it's a perfectly useable motor. If another comes up cheap enough, I might swap it at a later date, but it's fine for now, (I was told one of the Surrey Street Rodders may have one for sale).
Rockers taken from my spare engine & cleaned up. Exactly the same, except the hardened inserts that the valve stems move against are a different shape -circular on the old one, (look at the previous photo), & oval on these. I assume they're O.K to use?
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« Last Edit: May 29, 2013, 07:38:41 PM by Manky Monkey »
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On the last freedom moped out of Nowhere City.
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Manky Monkey
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« Reply #6164 on: May 29, 2013, 07:45:10 PM » |
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My big brother Brock, the drag racer, suggested the pushrod may have jumped out of it's semi circular recess in the top of the lifter & ridden on the edge of it, which would increase the lift, bending the rod.
No obvious signs of damage anywhere. I don't want to pull the head off if I don't have to, but if we'd holed a piston or something I think we'd have known about it, (no excessive smoke or sounds of mangled metal).
So I'll check the hydraulic lifter piston moves freely tomorrow & take a spare pushrod from the other engine. Then I suppose if nothing else comes to light, I may as well put it back together & see what happens.
Rained off again mid afternoon, so had to cover the truck up for the day. Back to it after work tomorrow.
Hydraulic lifter diagram.
1. Clip
2. Pushrod seat
3. Inner sleeve
4. Upper chamber
5. Non-return ball valve
6. Spring
7. Outer sleeve
8. Lower chamber - high pressure
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« Last Edit: May 29, 2013, 07:48:50 PM by Manky Monkey »
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