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| Connect tandem pump tester -VAS 5187- if necessary, with adapter -VAS 5187/7- or banjo bolt with seal -VAS 5187/1A- as shown. |
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| Install air filter housing again. |
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| Start engine and raise engine speed to 4000 rpm. |
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| Observe pressure indicated on pressure gauge. |
Specification: at least 7.5 bar, tandem pump OK. |
If the specification is not attained: |
If the specifications are still not attained: |
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| Using a hose clip, clamp-off return line between fuel filter and tandem pump. |
If specification is now obtained: |
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| Tandem pump is OK. Renew unit injector O-rings. |
If the specification is not attained: |
Note After removing pressure gauge, tighten plug to 25 Nm. Always renew seal. |
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