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16
ENGINE
16.4.18 Preparing timing chain tensioner for installation
16.4.19 Checking timing assembly
1
0 0 1
0 0 2
2
0 0 3
3
4
0 0 4
1
0 0 1
–
Mount the autodecompression shaft in the camshaft. Install a new lock ring.
–
Check the functioning.
»
If the autodecompression spring does not completely retract the autodecom-
pression shaft:
–
–
Fully compress the timing chain tensioner.
Info
This requires considerable force since the oil has to be pressed out.
–
Release the timing chain tensioner.
Without pressure, the timing chain tensioner expands fully.
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–
Place two compensating disks or similar aids next to the piston of the timing chain
tensioner. This should ensure that when pushed down, the piston does not fully
withdraw.
Guideline
Thickness of the compensating disks
–
Release the timing chain tensioner.
The latching system locks and the piston stops moving.
End position of piston after latching
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Info
This position is necessary for installation.
If the timing chain tensioner is now pressed in once more (while it is
installed) and then pulled out no more than halfway (preventing it from
coming out fully), the latching system locks and the timing chain tensioner
can no longer be compacted; this function is necessary to ensure sufficient
tension of the timing chain, even at low oil pressure.
–
Clean all parts well.
5
0 0 5
–
Check the timing chain gear / timing chain sprocket
»
If there is damage or wear:
–
–
Check timing chain tensioning rail
»
If there is damage or wear:
–
–
Check timing chain guide rail
»
If there is damage or wear:
–
–
Check timing chain securing guide
»
If there is damage or wear:
–
–
Check timing chain
»
If there is damage or wear:
–
–
Check that the timing chain links move easily. Let the timing chain hang down
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freely.
»
If the chain links no longer straighten out:
–
Replace the autodecompression spring.
Replace the timing chain gear / timing chain sprocket.
Change the timing chain tensioning rail.
for damage and wear.
3
Change the timing chain guide rail.
Replace the timing chain securing guide.
for damage and wear.
5
Change the timing chain.
Change the timing chain.
2... 2.5 mm (0.08... 0.098 in)
3 mm (0.12 in)
for damage and wear.
1
for damage and wear.
2
for damage and wear.
4
128
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