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Knocking noise

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07 Mar 2020 19:43 #219558 by jfkenpoman
Knocking noise was created by jfkenpoman
OK so it's been a while but I'm still getting a knocking noise which only appears to happen at 30mph whatever gear I'm in? The diff has been changed, wheel bearings checked and oil's changed in diff. Looking in engine bay at the fan, there seems to be a bit of play on the shaft which holds the fan. Is this normal? Or could this be the cause of the noise? Any ideas gents?
Regards
Jon

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08 Mar 2020 04:28 #219578 by Lambert
Replied by Lambert on topic Knocking noise
Play in the water pump shaft is not normal. Also have you checked the crankshaft pulley for play as they can delaminate and make odd noises. Also I once had a huge nail in a tyre that didn't leak air but on every rotation it would just touch the wheel and make a clanging noise and that took an age to find.

Dreadnaught (black 2011)

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09 Mar 2020 10:20 #219619 by jfkenpoman
Replied by jfkenpoman on topic Knocking noise
morning mate, the crankshaft pulley seems ok, I had one disintegrate on my last jimny, the wheels and tyres have been changed and noise still here. I presume that there will be a bearing that the fan sits in

jon

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09 Mar 2020 15:57 #219642 by Lambert
Replied by Lambert on topic Knocking noise
It's as easy and cheap to replace the water pump complete instead of trying to repair it.

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09 Mar 2020 19:59 #219656 by jfkenpoman
Replied by jfkenpoman on topic Knocking noise
is it easy to replace the water pump?

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09 Mar 2020 20:34 #219659 by Lambert
Replied by Lambert on topic Knocking noise
Yes. Radiator top hose off at radiator end. Release tension on drive belt by loosening the alternator. Unbolt the radiator shroud from the radiator and the fan from the pump and remove both together it's a bit fiddly but the shroud is pliable enough to avoid damage or if you prefer remove the radiator as wel it will make more space but isn't absolutely necessary. Remove water pump drive pulley and then you can get at the bolts to remove the pump. Some of the bolts are different lengths so remember what holes are which and off you go. You will need fresh coolant to refill the system when you are finished. Easy. Unless you have difficulty differentiating between a hammer and a spanner in which case a good garage will probably only charge an hour or two labour.

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