Volvo Penta TD520GE Workshop Manual page 17

Group 20
Determination of shim thickness when the injection valve opens
Performed when replacing engine block, camshaft, or roller tappet.
Mathematical formula for the new shim thickness:
T = L-[(Fb - Fb )x Vh
s akt nom
The actual shim thickness can be found in Table 2. S
NOTE! After determining the shim thickness, a new EP code MUST ALWAYS be determined, according to
"Calculation 3", in order for changing of pump to be correct at a later point in time.
Calculation 2.1 Explanation
Cylinder no.
Injection pump manufacturing number
Injection angle, meas. on protractor.
Injection angle, see engine id. plate ∠° Fb
Total 1 (Fb - Fb )
akt nom
Pre-stroke, corr.factor, see Table 1
Total 2 (S1 x Vh )
korr
Pre-stroke, see Table 1
Basic meas. of inj. pump, see Table 1
Manufacturing tolerance, see inj.pump
Total 3 (S2+ Vh +L +A/100)
nom 0
Calculation 2.2 Explanation
Length between block and roller tappet
Total 3 (S2+ Vh +L +A/100)
nom 0
Theoretical shim thickness (L - S3)
Shim thickness, see Table 2
FACTOR UNIT
Fb ºC/A
akt
Fb ºC/A
nom
Vh mm/ºC/A
korr
Vh mm
nom
L mm
L mm
0
A/100 mm
T mm
s
S mm
s
S (1, 2, 3) xxx
EP xxx
E mm
k
+ Vh + L + A/100)]
korr nom o
Factor
XXX
XXX
Fb
akt
nom
S1
Vh
korr
S2
Vh
nom
L
0
A/100
S3
Code
L
S3
T
s
Ss
EXPLANATION
Injection angle, measured on protractor according to method.
Injection angle, see table 1.
Pre-stroke, correction factor see table 1.
Pre-stroke, nominal, see table 1.
Measured length between block and roller tappet.
Basic measurement of injection pump.
Manufacturing tolerance, written on injection pump.
Theoretical shim thickness.
Shim thickness.
Total of calculation.
Code value, see table 3 or engine identification plate.
Total of calculation. Only applicable when determining EP code.
→ T
s s
Ex TD/TAD 520 GE, TD/TAD 720 GE
XXX Cyl. 1 Cyl. 2
XXX
5.5
- 6
= -0.5
x 0.14
= -0.07
+ 6.11
+ 143
+ 0.63
= 149.67
Ex. Cyl. 1 Cyl. 2
152.18
- 149.67
= 2.55
~ 2.6
Technical data
Cyl. 3 Cyl. 4 Cyl. 5 Cyl. 6
Cyl. 3 Cyl. 4 Cyl. 5 Cyl. 6
27