Water Pump - Checking
ProductCars
Group
26
No.
31
Subject:
Water pump checking
B230F
240
Date: February 1988
THIS BULLETIN APPLIES TO THE U.S. AND CANADA, AND SUPERSEDES SB 26-31, JULY 1987.
REFERENCE: TP 31074/1 (English), B230F Engine
WATER PUMP, CHECKING
Water pumps are sometimes replaced when, for instance, only a gasket is leaking. If excessive coolant loss is suspected, the cooling system should be pressure-tested to determine if the system is leaking and the location of the leak.
NOTE:
If it is not verified that the system is losing coolant, a small discoloration around the drain hole for the water pump shaft seal is not evidence of active coolant leakage, and Is considered a normal operating condition.
The water pump shaft seals are designed to operate utilizing the coolant as a lubricant. This will create a very small seepage of coolant through the drain hole during engine cooldown. An improved pump seal that will minimize this seepage has been introduced into production starting with coolant pump date code 645.
COOLING SYSTEM, PRESSURE TEST
PARTS REQUIRED: Description Part No.
Expansion tank cap (white) 1357776-2
SPECIAL TOOLS: Pressure tester 9985496-0
WARM-UP ENGINE
Warm-up engine until thermostat opens.
Turn off engine
Temporarily install white expansion tank cap (P/N 1357776-2)
Connect pressure tester, using T-piece, to small hose connected between radiator and expansion tank.
Increase pressure to approx. 90-95 kPA (13.0-13.8 psi).
Visually inspect the following areas for active coolant leakage (droplets)
1. Sealing ring, pump-cylinder head, no active coolant leakage allowed.
2. Gasket on cylinder block, no active coolant leakage allowed.
3. Drain hole from shaft seal. A quantity of one (1) drop per minute (under pressure) is allowed and considered normal. Anything exceeding this means the pump must be replaced. Stains on the pump housing are not cause for replacement unless the rate of coolant loss exceeds the standard.
4. Return pipe from car heater, no active coolant leakage allowed.
5. Connection to lower radiator hose, no active coolant leakage allowed.
Corrective action:
1. Replace seal.
2. Replace gasket.
3. Install new water pump, incl. gaskets.
4. Install new gaskets.
5. Tighten/replace hose clamp or hose as required. Remove any corrosion.
WATER PUMP, REMOVING/INSTALLING
Drain cooling system
Disconnect battery ground lead.
Move heater control to "warm".
Remove expansion tank cap.
Unscrew drain tap on right-hand side of cylinder block.
Disconnect hose from bottom of radiator.
Remove fan, preheating hose clip beneath fan shroud (if applicable), and fan shroud.
Remove drive belts and water pump pulley
- loosen belt tensioners
- remove all drive belts
- remove pump pulley
Remove upper timing gear cover
1. M6 bolts
2. M8 bolt
3. panel screw
Disconnect return pipe from water pump
Remove bolt, washer, gasket and nut.
Remove water pump
Remove all bolts, washers and nuts.
Clean gasket face and contact faces
Remove all traces of gasket from block and water pump. Clean rubber ring contact face, cylinder head side
Install water pump
Place a new gasket between pump and cylinder block.
Place new O-ring on water pump.
Secure pump by two nuts. Make sure that 0-ring is correctly positioned and not damaged. Tighten nuts until pump can just be pushed upwards.
Pry water pump against cylinder head
Fit remaining washers and bolts. Tighten bolts and nuts.
Reconnect return pipe
Fit a new rubber seal.
Fit upper timing gear cover
1. M6 bolts
2. M8 bolt
3. panel screw
Reinstall:
- water pump pulley
- drive belt (loosely)
- lower radiator hose
- fan shroud
- preheating hose clamp
- fan.
Tighten drive belts
It should be possible to depress belt 5-10 mm (3/16 - 3/8 in) with thumb when correctly tightened.
Fill with Volvo Type C coolant mixed 50/50 with clean water.
Tighten drain tap.
Fill expansion tank to max.
Warm-up engine (make sure that heater control is set to max heat) Check for leaks. Top-up coolant as required.
Refit original expansion tank cap.
During New Car Warranty, claims must be submitted. (see illustration)