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Location:
Perth
Registered:
May 2003
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Re: 18RG rebuild
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Sat, 05 July 2003 01:31
 
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Went and checked this morning on those rings. And yes 18RG rings are different. The 18RGEU runs 1.5mm thick 1st and 2nd comp rings, while the 18R runs 2.5mm 1st and 2nd comp rings. The earlier 18RG may have a thicker 2nd comp ring but it has been ages since the rebuild and I cant remember.
The head is obviously entirely different (I am pretty sure that everything - valves, stem seals, springs etc are all different, someone else may disagree). Better off getting it rebuilt by someone who knows how to do those sort of heads (cam over bucket). You can't shave them anymore than than 1mm before running into valve clearance problems etc, so be sure to get one that isn't too warped (straightening a warped head = big dollars). If you get a decent head shop they should be able to machine the tops of the valves to get the proper clearances as opposed to adjusting the shims. If you do choose to adjust the valves by the shims then a motor cycle place is the place to go for the needed shims.
Have a read of this, it should be helpful:
http://www.toysport.com/2tg_18rg_3tg_tech_notes.ht m
Also useful to get hold of an engine manual for the engine. I have one for an 18R/18RC/18RG, it was very useful !!!!
And remember when the engine is being put together, get the cams in the right place before putting on and tightening down the head, or else you will bend the valves !!!! (NO, I didn't do this either)
Tyron.
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