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eight valve engine ? think their hydraulic ? cannot remember to be honest ,if shimmed then anything between 8 to 12 inlet and maybe a bit wider for the exhaust ,dont have a book here to look in for you ,some of the very old engines had the same settings for inlet and exhaust ,wow showing my age here with side valve engines .
Mar 3, 2004 - 15 posts - 6 authors
Does anybody know what is the valve clearance for inlet and outlet for this type of engine? ... Nissan Xterra Forum · Nissan Armada Forum · Nissan Frontier Forum ·Nissan Titan Forum ..... the head so they don't burn up, especially the exhaust valves.Tight exhaust valves are the #1 reason they burn up.
Now if you mean the tappet or valve clearances then 12th inlet and 14 exhaust will work on any engine except certain GT versions on old 70s engines which clacked like hell and was like 22th exhaust and 20 inlet but these motors dont exist anymore
this table will help you. I used to own one.. beautiful bikes easy to work on too!
Valve clearance: Inlet 0.13 0.19 mm
Exhaust 0.18 0.24 mm
Valve head thickness: Inlet 0.5mm 0.25 mm
Exhaust 0.8mm 0.5mm
Valve stem bend 0.05 mm TIR
Valve stem diameter: Inlet 4.975 4.990 mm 4.96 mm
Exhaust 4.955 4.970 mm 4.94 mm
Valve guide inside diameter 5.000 5.01 2 mm 5.08 mm
Valve/valve guide clearance
(wobble method): Inlet 0.02 0.07 mm 0.18 mm
Exhaust 0.06 0.11 mm 0.21 mm
Valve seating surface:
Outside diameter: Inlet 30.8 31.0 mm
Exhaust 26.3 26.5 mm
Width 0.5 1.0 mm
Valve spring free length: Inner 35.5 mm 33.6 mm
Outer 40.5 mm 38.6 mm
Valve seat cutting angle 32 degrees, 45 degrees, 60 degrees
the easiest way is to start at the first valve,first you need to know if the inlet & exhaust valves have the same clearance, starting from the left side of the engine ( standing at the front ) the first valve exhaust, the next two are inlet, the next two are exhaust, the next two are inlet & the last one is exhaust, what you do is turn the engine over by hand ( this might be easier if you remove the spark plugs ) until the valve opens & closes, after it closes turn the engine a little more & adjust the clearance on that valve, repeat this action on every valve until they have all been adjusted.......hope this helps......cheers.
my mate says that if the gaps are bigger then its ok and that it's when they are smaller that u need to do something about them is this true?
bit of xtra info:
the manual says inlet 0.15mm and exhaust 0.25mm clearance.
my bike measures inlet 0.20mm and exhaust 0.30mm
i'm just a bit concerned 'cos if the worst happens i wo'nt be able to afford a top end rebuild.You should try and keep the clearance to 0.15 in and 0.25 ex.
With the de-comp it is cridical to have the exhaust clearance correct.
On the early 400/450 they had some cam problems so check the shim
buckets and cams are not worn.,