760 L4-2320cc 2.3L SOHC Turbo VIN 87 B230FT (1985)
Wastegate: Testing and Inspection
Testing Wastegate Diaphragm
WASTEGATE VALVE OPENING PRESSURE TEST
1.
Disconnect the wastegate diaphragm pressure hose and check it for condition. Replace if necessary.
2.
Connect pressure tester Volvo part #5230 (or equivalent) to the diaphragm.
3.
Increase pressure consistently. Wastegate valve should start opening:
Between: 46 - 54 kPa (6.5 - 7.7 psi)
If valve does not open, adjust the diaphragm rod linkage (refer to ADJUSTMENT PROCEDURES) and retest. If problem can't be repaired by
adjusting the link rod, remove the rod from the wastegate valve. Check that the valve operates freely.
a. If valve operates freely, replace and retest with new wastegate diaphragm (refer to COMPONENT REPLACEMENT AND REPAIR
PROCEDURES).
b. If valve is binding or stuck, replace and retest with new wastegate valve and housing (refer to COMPONENT REPLACEMENT AND
REPAIR PROCEDURES).
4.
If proceeding with the MECHANICAL INTEGRITY TEST, release pressure, but do not disconnect the pressure gauge.
If not proceeding with the MECHANICAL INTEGRITY TEST, release the pressure and disconnect pressure gauge. Reconnect the pressure hose.
MECHANICAL INTEGRITY TEST
1.
With pressure gauge connected (as described in steps 1 and 2 of previous test), apply pressure to:
Reading: approx. 46 kPa (6.5 psi)
Stop applying pressure and check that the diaphragm can hold that pressure.
If diaphragm leaks, replace and retest with new wastegate diaphragm.
Release the pressure and disconnect pressure gauge. Reconnect the pressure hose.
Checking Basic Position
2.
Remove link rod from wastegate valve shaft.
3.
Let go of rod and mark shaft in its resting position.
4.
Reconnect link rod to wastegate valve shaft.
5.
Measure distance between mark and wastegate diaphragm.
Reading: 0.079 - 0.236 in (2 - 6 mm)
If reading is incorrect, replace (refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES) and retest with new diaphragm.