Checking The Timing Assembly; Preparing The Timing Chain Tensioner For Installation - KTM 400 EXC AUS 2011 Repair Manual

301ENGINE - WORK ON THE INDIVIDUAL PARTS
130
Chackina tha timina assembly
/8
. ~
co§?
.,
\
I
C1!
C1!
~O
I4t
200173-01
Praparinalha timin
Intake
134.20 ... 34.40 mm (1.3465 ...
1.3543 in)
• If the measured value does not meet specifications:
- Change the camshaft.
- Clean all parts well.
- Check the timing chain wheelltiming chain sprocket
0
for damage and wear.
• If there is damage or wear:
- Replace the timing chain wheelltiming chain sprocket.
- Check the timing chain tensioning rail. for damage and wear.
• If there is damage or wear:
- Replace the timing chain tensioning rail.
- Check the timing chain guide rail. for damage and wear.
• If there is damage or wear:
- Replace the timing chain guide rail.
- Check the timing chain securing guide. for damage and wear.
• If there is damage or wear:
- Replace the timing chain securing guide.
- Check timing chain. for damage and wear.
• If there is damage or wear:
- Replace the timing chain.
- Check the timing chain links for smooth operation. Let the timing chain hang down
freely.
• The chain links no longer align in a straight line:
- Replace the timing chain.
- Press the timing chain tensioner together completely.
• Info
I
This requires some force. as the oil must be pressed out.
- Release the timing chain tensioner.
, / Without pressure. the timing chain tensioner expands fully.
- Place two spacing washers or similar aids next to the timing chain tensioner piston.
This ensures that, when pressed in, the piston cannot go in all the way.
Guideline
1
Th ickness of the spaci ng washers 12 ... 2.5 mm (0.08 ... 0.098 in)
- Release the timing chain tensioner.
, / The detent mechanism engages and the piston remains in place.
Final position of the piston after
engagement
• Info
3 mm (0.12 in)
I
This position is necessary for installation.
If the timing chain tensioner is now pressed again and is only extended a
maximum of half way
(it
is prevented from extending completely). This locks
the detent mechanism and the timing chain tensioner can no longer be
squeezed together. This function is necessary in order to ensure sufficient
timing chain tension even at low oil pressures.
301ENGINE - WORK ON THE INDIVIDUAL PARTS
130
Chackina tha timina assembly
/8
. ~
co§?
.,
\
I
C1!
C1!
~O
I4t
200173-01
Praparinalha timin
Intake
134.20 ... 34.40 mm (1.3465 ...
1.3543 in)
• If the measured value does not meet specifications:
- Change the camshaft.
- Clean all parts well.
- Check the timing chain wheelltiming chain sprocket
0
for damage and wear.
• If there is damage or wear:
- Replace the timing chain wheelltiming chain sprocket.
- Check the timing chain tensioning rail. for damage and wear.
• If there is damage or wear:
- Replace the timing chain tensioning rail.
- Check the timing chain guide rail. for damage and wear.
• If there is damage or wear:
- Replace the timing chain guide rail.
- Check the timing chain securing guide. for damage and wear.
• If there is damage or wear:
- Replace the timing chain securing guide.
- Check timing chain. for damage and wear.
• If there is damage or wear:
- Replace the timing chain.
- Check the timing chain links for smooth operation. Let the timing chain hang down
freely.
• The chain links no longer align in a straight line:
- Replace the timing chain.
- Press the timing chain tensioner together completely.
• Info
I
This requires some force. as the oil must be pressed out.
- Release the timing chain tensioner.
, / Without pressure. the timing chain tensioner expands fully.
- Place two spacing washers or similar aids next to the timing chain tensioner piston.
This ensures that, when pressed in, the piston cannot go in all the way.
Guideline
1
Th ickness of the spaci ng washers 12 ... 2.5 mm (0.08 ... 0.098 in)
- Release the timing chain tensioner.
, / The detent mechanism engages and the piston remains in place.
Final position of the piston after
engagement
• Info
3 mm (0.12 in)
I
This position is necessary for installation.
If the timing chain tensioner is now pressed again and is only extended a
maximum of half way
(it
is prevented from extending completely). This locks
the detent mechanism and the timing chain tensioner can no longer be
squeezed together. This function is necessary in order to ensure sufficient
timing chain tension even at low oil pressures.