XJRider.com

Posted: **Mon Jun 11, 2018 7:10 am**

Hello everyone, this weekend I started with the process of adjusting valve clearance but when measuring I found a measure that left me completely unsettled.

The standard values for the clearances are:

Intake: between 0.11mm and 0.15mm
Exhaust: between 0.21mm and 0.25mm (Haynes says that the minimum could get 0.18mm but I think it's too much)

It turns out that the intake valve of cylinder 2 gave me a measurement less than 0.02mm (it is the thinnest gauge I have and it didn't slide in).

Had anyone seen this before?
Is such a small value possible without having valve damage or engine problems?

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As additional information I leave the measures to give you an idea:
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Code: Select all

                        INTAKE                        EXHAUST
CYLINDER        CLEARANCE        SHIM        CLEARANCE        SHIM
1               0,16             2,80        0,22             2,65
2               (*)              2,75        0,28             2,62
3               0,10             2,78        0,26             2,75
4               0,16             2,80        0,19             2,75

(*) The gauge of 0.02mm does not slide in so it could have two values acording to gauges: 0.01mm / 0.00mm

If we do the maths the new clearances will be as following:

Code: Select all

                        INTAKE                        EXHAUST
CYLINDER        CLEARANCE        SHIM        CLEARANCE        SHIM
1               0,11             2,85        0,22             2,65
2               (*)              (**)        0,25             2,65
3               0,13             2,75        0,26             2,80
4               0,11             2,85        0,24             2,70

(*) The gauge of 0.02mm does not slide in so it could have two values acording to gauges: 0.01mm / 0.00mm
(**) For 0.01mm: shim 2.65mm (final clearance: 0.11mm)
     For 0.00mm: shim 2.60mm (final clearance: 0.15mm)

According to this there could be a problem if I assume that the clearance has one of the values and it turns out to have the other:

If I assume 0.01mm I put the 2.65mm shim but if it turns out that the value is 0.00 there would be a gap of 0.10mm.
If I assume 0.00mm I put the 2.60mm pill but if it turns out that the value is 0.01 there would be a clearance of 0.16mm.

Not to risk, the solution would be to reuse the 2.62mm shim of the cylinder 2 exhaust valve so that the clearances could be within the limits in both cases:

For 0.01mm final clearance: 0.14mm
For 0.00mm final clearance: 0.13mm

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XJRider.com

Odd value in valve clearance

Odd value in valve clearance