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NOTE: the below applies to the water pump itself, but this intervention can only be carried out while replacing the timing belt, please refer to the dedicated timing belt page (links further below) for overall difficulty and costs indexes:
DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction. Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability. BEFORE YOU START
The water pump of the Renault K4m engine is systematically replaced while changing the timing belt at Km 120,000 and again with the same frequency, meaning every other timing belt change. Click the below links for the replacement of the timing belt: |
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This pictorial applies to the Renault K4M 1.6 16v engine found on:
- Dacia or Renault Sandero 1.6 16V,
- Dacia or Renault Logan & Logan pick-up 1.6 16V
- Nissan NP200 1.6 16V
- Renault Symbol 1.6 16V
- Dacia or Renault Duster 1.6 16V
- Renault Kangoo 1.6 16V
- Dacia Dokker 1.6 16V
- Nissan Kubistar 1.6 16V
- Renault Clio 2 1.6 16V
- Renault Megane 2 and Megane 3 1.6 16V
- Renault Scenic 2 1.6 16V
- Renault Laguna 1 and Laguna 2 1.6 16V
- Lada Largus 1.6 16V
Symptoms of a defective water pump
- Grinding noise from engine
- Grinding noise particularly strong on the right side of vehicle (transversal engines)
- Excessive coolant consumption
- Engine overheating problems in extreme water pump wear cases
The black powder residues on the external body of this Renault water pump, near and around its sprocket, do confirm an excessive wear that requires the pump replacement. This material is resulting from the normal wear of the water pump seal, bearing and shaft.
Water pump replacement on Renault K4M engine (similar on other engines, makes and models)
After removing the timing belt of the Renault 1.6 16V engine, you can access the water pump which can be dismantled once all of its fixing bolts are taken out.
It is advised to drain the coolant prior to this intervention by disconnecting the lower radiator water tube and letting the coolant flow over a bucket. You still can avoid draining the coolant, but then, get ready to have it flowing out of one of the bolts you remove when unscrewing the water pump. Have a bucket at hand to collect the used coolant.
Some bolts are of difficult access, and most are size 8 except one which is size 10 so have in hand:
It is advised to drain the coolant prior to this intervention by disconnecting the lower radiator water tube and letting the coolant flow over a bucket. You still can avoid draining the coolant, but then, get ready to have it flowing out of one of the bolts you remove when unscrewing the water pump. Have a bucket at hand to collect the used coolant.
Some bolts are of difficult access, and most are size 8 except one which is size 10 so have in hand:
- Long combination spanner size 8
- Elbow (L-shaped) socket wrench size 8
- A set of 1/4" ratchet handle with sizes 8 and 10 sockets
Once all bolts are removed, the water pump can be easily separated from the engine and taken out from underneath the vehicle:
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Refitting a new water pump on the Renault K4M engine
Clean well the gasket surface on the engine block with the blade of a scraper then with a grit 220 or 300 sandpaper.
Apply a thick coat of silicone gasket maker on the engine side of the supplied water pump gasket.
You may use any RTV silicone gasket maker or the one from Renault.
Make sure to circle all holes and bolts passages, then hold the gasket to the engine block, simply by pressing it all over its surface.
The silicone will let it stick there while you continue working.
You may use any RTV silicone gasket maker or the one from Renault.
Make sure to circle all holes and bolts passages, then hold the gasket to the engine block, simply by pressing it all over its surface.
The silicone will let it stick there while you continue working.
Plug the three holes shown in this picture with silicone gasket maker also:
Refit the water pump making sure it is well in its intended place:
Refit the timing belt tensioner stud and all water pump bolts.
Tighten first all bolts by hand, then by alternating inner / outer and right / left.
You do not need to tighten much, the required torque is 1.5 mKg but you cannot fit a torque wrench in the tiny space.
Tighten first all bolts by hand, then by alternating inner / outer and right / left.
You do not need to tighten much, the required torque is 1.5 mKg but you cannot fit a torque wrench in the tiny space.
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Refilling with coolant and bleeding the coolant circuit
Since RTV gasket maker has been used, it is not possible to refill the engine with coolant prior to 6 hours from the intervention.
In the meantime, you can continue refitting the timing and serpentine belts.
In case you had completely drained the coolant circuit, check our below link to see how to proceed with the refill, if you just allowed the coolant to flow out of the water pump bolts, then proceed as shown below:
In the meantime, you can continue refitting the timing and serpentine belts.
In case you had completely drained the coolant circuit, check our below link to see how to proceed with the refill, if you just allowed the coolant to flow out of the water pump bolts, then proceed as shown below:
- Refill the coolant expansion tank to beyond its maximum level and let the coolant go down in the circuit, then refill again.
- Keep doing so until the level doesn't change anymore.
- Open the purge valve on the coolant hose which connects to the car heater (picture to the right) and let the coolant flow out, then close the valve and refill the tank.
- Turn on the engine, let it heat and use your vehicle normally.
- Adjust the coolant level the next day before starting your car.
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