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Location:
Finland
Registered:
November 2002
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18R-G valve gear clearances...
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Tue, 10 August 2004 14:55
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I don't have (yet) work shop manual for 18R-G, so could someone check the valve lifter (bucket) min. and max. diameter. It's the same for intake and exhaust, right?
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Location:
Perth WA
Registered:
August 2003
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Re: 18R-G valve gear clearances...
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Wed, 11 August 2004 04:07
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According to my workshop manual 18RG bucket clearance should be 2mm approx, both inlet and exhaust. Intake valve clearance 0.24-0.34mm. Exhaust valve clearance should be 0.29-0.39mm.
Calculate thickness of new pad so valve clearance comes within specs
T1 **Thickness of pad used
A **Valve clearance measured
Intake side
New pad thickness
=T1 + (A - 0.29mm) 0.29mm being desired clearance
Exhaust Side
=T1 + (A - 0.34mm) 0.34mm being desired clearance
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: 18R-G valve gear clearances...
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Wed, 11 August 2004 06:12
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inlet 9 to 13 thou exhaust 11to 15 thou hope this is easier than mm
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Location:
Finland
Registered:
November 2002
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Re: 18R-G valve gear clearances...
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Wed, 11 August 2004 12:27
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Thanks!
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According to my workshop manual 18RG bucket clearance should be 2mm approx, both inlet and exhaust. Intake valve clearance 0.24-0.34mm. Exhaust valve clearance should be 0.29-0.39mm.
Calculate thickness of new pad so valve clearance comes within specs
T1 **Thickness of pad used
A **Valve clearance measured
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Did you mean 0.2mm or are we talking about same clearance?
Holes for the buckets were from 38.05mm to 38.16mm from memory. Shouldn't the bucket diameters be something like 37.90mm.
I managed to obtain a RG head but it's blank. I'm going to get OS SS-valves for it. Saabs have 38.00mm buckets so I'm going to machine these to fit.
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Location:
Canberra
Registered:
May 2002
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Re: 18R-G valve gear clearances...
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Wed, 11 August 2004 12:51
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Can someone check their 2TG books for this guy. The buckets are the same on 18RG and 2TG. Just dont have access to my books at the moment.
regards Chuck.
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: 18R-G valve gear clearances...
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Wed, 11 August 2004 13:31
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it should be a nice free/sliding/running fit.
not as close as the wrist/gudgeon pin in the piston, and not as loose a clearance as the piston in the bore.
i'd worry more about the heads bore diameter then the bucket/follower/lifter diameter.
i'd go by the clearance specs for ANY OTHER head with a similar design.
i have no experience with this engine.
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Location:
Perth
Registered:
May 2003
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Re: 18R-G valve gear clearances...
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Wed, 11 August 2004 13:42
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From the 18RG manual there are four different bucket sizes (refered to as valve lifters).
Black: 37.925-37.931mm
Blue: 37.931-37.937mm
Yellow: 37.937-37.943mm
Red: 37.943-37.949mm
Oil Clearance STD 0.02-0.03mm
Limit 0.1mm
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