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Post subject: RD 500 Cylinder head problem
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titters Find me a Road! |
Hi all
could anyone help me with a problem with my recently puurchased RD 500! i have stripped the heads and barrels off to check, clean and replace the gaskets as i had a water leak from somewhere, but now i have put everything back together with new gaskets the engine will not turn over? As soon as a piston from either top or bottom reaches TDC it stops which suggests to me either gaskets not thick enough or head has been skimmed to much? any advice welcome.
cheers
Chris
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Posted: Wed Jun 18, 2008 10:11 pm
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hybrid  Rear-wheel Steering! Joined: 07 Aug 2003 Total posts: 2674 |
Are the pistons oversize?
Did you check that the piston can fit through the holes in the head gasket?
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Posted: Thu Jun 19, 2008 12:17 am
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z1100r Ace of Spades Joined: 05 Aug 2003 Total posts: 4836 Location: Coventry |
 ..what your describing is imposible...
If it turned over before you took it apart and all you've done is replace gaskets..either a super strong giant cockroach has crawled in..your timing chain is shagged...one of the valves has dropped, or half your toolbox is in the crankcase...
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Posted: Thu Jun 19, 2008 7:28 am
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jante350 RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5372 Location: Bergen, Norway |
Piston in the wrong way around (arrow should face the exhaust) making the piston ring catch in the exhaust port?
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Posted: Thu Jun 19, 2008 8:31 am
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tittersFind me a Road! |
| z1100r wrote: |
..what your describing is imposible...
If it turned over before you took it apart and all you've done is replace gaskets..either a super strong giant cockroach has crawled in..your timing chain is shagged...one of the valves has dropped, or half your toolbox is in the crankcase... |
I know its doing my head in mate. with out the heads on it turns over fine? and its a 2 stroke no valves or timing chain included
chris
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Posted: Thu Jun 19, 2008 5:00 pm
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tittersFind me a Road! |
| hybrid wrote: |
Are the pistons oversize?
Did you check that the piston can fit through the holes in the head gasket? |
i am going out to check this now
cheers
Chris
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Posted: Thu Jun 19, 2008 5:01 pm
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tittersFind me a Road! |
| jante350 wrote: |
| Piston in the wrong way around (arrow should face the exhaust) making the piston ring catch in the exhaust port? |
hi there
did not even take them off the rods!!! just checked and arrows point to exhaust?
Chris
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Posted: Thu Jun 19, 2008 5:03 pm
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jante350RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5372 Location: Bergen, Norway |
Weird thing this... anything else you might have changed aswell? Long reach spark plugs??
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Posted: Thu Jun 19, 2008 8:12 pm
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tittersFind me a Road! |
| jante350 wrote: |
| Weird thing this... anything else you might have changed aswell? Long reach spark plugs?? |
Hi there,
no mate not changed anything else, all i can think is that there might of been 2 base gaskets or a thicker cylinder head gasket? When i got the bike the engine was looking like it had been put together with a catapult with loads of gasket goo around the head and base gasket. Does any one know how thick the head should be? All i can think of to correct it is use 2 base gaskets to lift the barrels up a touch and try again to torque the heads down again
cheers
Chris
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Posted: Thu Jun 19, 2008 10:23 pm
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tittersFind me a Road! |
| hybrid wrote: |
Are the pistons oversize?
Did you check that the piston can fit through the holes in the head gasket? |
Hi there
yep the piston will pass through the gasket ok, they are oversize 0.75
cheers
Chris
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Posted: Thu Jun 19, 2008 10:25 pm
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z1100rAce of Spades Joined: 05 Aug 2003 Total posts: 4836 Location: Coventry |
Have you found out wether its front or back....?? or both....measure the barrel length from face to face ....has that been skimmed...??
Std barrel length = 90mm (face to face)
Std head thickness = 30mm (from head face to stud/nut face)
Have the heads just been skimmed without the squish being cut back in...if so the rear will look really weird.
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Posted: Thu Jun 19, 2008 10:42 pm
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jante350RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5372 Location: Bergen, Norway |
If this is the case, and the job looks dodgy, please check the squish with a bit of solder to see if its not too tight.. might cause detonations and havoc if its too tight..
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Posted: Fri Jun 20, 2008 7:46 am
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