Do i have to take cambelt of to change water pump on subaru impreza

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However see if fan/waterpump drive belt is slipping. Coolant is frozen
inlet or outlet water hoses are clogged or kinked. Coolant tube is blocked. Temperature gause is defective. Water pump defective. Fan is too far from radiator,(close it) .Defective water distribution tube. replace the tube. Fan insuficient blade are or pitch replace with large fan or with more blades.
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do i have to take cambelt of to change water pump

Hi this sounds weird does the smoke come out from the front engine covers? the squealing could be the cambelt trying to turn a semi or completly ceased waterpump which would cause the smoke after a while, also without the waterpump working properly the engine will leak water and anti freeze out the overflow and overheat really quickly

Hi there,

Most Japanese designed engines have an internally mounted water pump, usually driven by the cambelt.

When we talk in terms of cam design, there are two types of engines: a) Interference and b) non-interference.

An interference egine means - if the cambelt were to break whilst engine is running, there will be major internal engine damage.
A non-interference engine means - if the cambelt were to break whilst engine is running, there will NOT be any serious internal damage to the engine.

Note: the GS300 engine (3.0L 6-cyl) is considered a Non-Interference engine.

So, one of the most critical compenents which MUST be changed, is the cambelt itself. Most manufacturers recommend changing this belt every 90,000 - 100,000km's (80,000 miles). If you have a non-interference engine, this period is not as critical, but should still be changed soon, to avoid the inconvenience of a breakdown whilst travelling.

The 2nd critical compenent is the Water Pump. The worst possible outcome of a failed waterpump, is your engine will suddenly drain of all coolant, resulting in serious overheating, causing serious internal damage to your engine.

Although there is no specified time to change the waterpump, a waterpump endures wear and tear like any component and lifespan can reduce rapidly beyond 100,000km's (80,000 mles). As the waterpump is situated next to the cambelt, it is a general rule to change out both cambelt and waterpump at the same time.

The majority of the cost to replace the cambelt, is in labor (ie opening the engine etc). If you choose to replace only one of these components, you will need to be prepared to pay for same procedure again in future, to replace the 2nd component.

Therefore, it can be more economical in the long term, to have both components changed together.

Hope this helps...


Scott




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This could be waterpump or one of the idler bearing guides that support the cambelt. You will need to get the cambelt covers off at the front. These are the big black plastic covers on the front of the engine.

The waterpump is driven by the cambelt. It is under the big black plastic cambelt cover at the front of the car. It is not absolutely essential to remove the rad but it is only 4 bolts and two hoses to get it out and it gives you alot more room to work. I would change the cambelt while I was there also to be honest. It will all have to come off again when you change the belt soo.... If you are not familiar with changing cambelts and timing it up I would let a pro do it. It is not worth the chance you might mis time it and ruin your engine.

water pump is ran by the timing belt. when changing the water pump the belt should be changed to. and sometimes the timing belt tensioner needs to be replaced too.worst case senerio. about a 350-400$ repair.

I would suggest putting in a new water pump. You could take the existing one off and try to seal it but for me it would make more sense to replace it since you have the old one out. They're not too expensive. Mine was $20. You'll need a tube of high temperature gasket sealer to go around the edges of the new pump. Also, make sure you use the gasket that is with the new pump. Hope this helps ya.

REMOVE BELTS FROM FRONT OF ENGINE, REMOVE COVER ON TIMING BELT, REMOVE TIMING BELT AFTER MARKING THE WHEELS WITH THE ARROWS ON THE CAM SHAFT WHEELS. WATER PUMP IS LOCATED AT BOTTOM HOSE HOUSING IT IS A COMPLETE UNIT INCLUDING CASTING. EASY TO FIT REPLACE ALL PART AND MAKE SURE TIMMING BELT IS NOT OUT OF SEQUENCE GOOD LUCK.