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14th May 2024, 09:18 | #1 |
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Rover 75 Saloon. 2,5 V6 Conn.SE auto, Moonstone green, White gold, Dorchester red Join Date: Mar 2018
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Engine noise KV6 2,5 R75
Hello,
one of my 2.5 V6 engines recently started making two different side noises: 1: ticking noise from intake manifold. Check showed that the power VIS motor was faulty, since replaced. Also, the oil level was not too low but on the low side. By adding extra oil up to the maximum level, the noise decreased considerably. Check of the internal manifold arm driven by the power vis motor is good, no play present, just in and out. Possibly switch to 5W40 oil? 2: Buzzing/abrasive noise, stronger while driving and loading the engine (accelerating). What is most likely to cause the noise? Bearing of the alternator drive roller? I have made a movie with a stethoscope: https://youtube.com/shorts/-7iOXThKBR8?feature=share From the post-purchase lore, the timing belts, water pump, tensioners were replaced in 2018 (at 36K miles). Current odometer reading 50K miles. It is not super present, but I like to drive as quietly as possible. Where is the noise coming from and what to do about it? Thanks in advance. Emiel
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14th May 2024, 10:13 | #2 | ||
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Quote:
Did you follow the official procedure for checking the dipstick level on your KV6? Here is MG Rover's guidance: "A significant amount of engine oil is retained in the upper levels of the engine. Should a level check be carried out on an engine that has recently been switched off, a low oil level reading may result. This may mislead dealers and customers into concluding that the engine has consumed a quantity of oil. A revised oil level checking procedure has been developed and will be introduced into future editions of the owners handbook. The procedure is as follows: 1. Ensure that the engine is at full working temperature. Turn off the engine. 2. Remove the dipstick and allow the oil to drain down for 5 minutes. 3. Clean the dipstick and insert it gently into the tube until the 'O' ring on the handle moulding is about to enter the tube. 4. Slowly push dipstick fully home. 5. Wait for 5 seconds, withdraw the dipstick and take the level reading. Should a second reading be required it will be necessary to repeat operations 2 to 5 to allow the dipstick tube to drain down. Similarly, should it be necessary to add oil to the engine, operations 2 to 5 must be repeated. Having said that, the ticking noise you've reported from the inlet manifold area is almost certainly contamination of the hydraulic tappets. This can be addressed by a session with flushing oil (temporarily replacing the engine oil at a fast idle only). In the UK we have Comma Flush Out which is very effective. It should not be necessary to use 5W40 oil whose viscosity won't be any different at normal operating temperature anyway. Quote:
Simon
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15th May 2024, 13:39 | #3 |
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Hello Simon,
many thanks for your response, I have checked the oil-level on a cold motor. Thanks for sharing the formal procedure though. I will for sure follow your advice to flush the oil in the motor. I have just bought 15 liters of 10W40 and I will have a look at the comma flush out your have mentioned. I have changed the oil 8,5 K miles ago (9 months) and I used castrol GTX ultra clean and I tend to use this oil after the flush. The buzzing/abrasive noice is indeed not loud luckely. Maybe when the temperature goes down a bit I can make a movie if the sound is stronger (maybe the 28 degrees at the moment is of influence, don't know). Anyway, thanks Simon and for starter I will go with the oil flush. Cheers from Holland, Emiel
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Last edited by Azur; 15th May 2024 at 13:56.. |
15th May 2024, 13:57 | #4 |
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Do come back to us Emiel after you've used the flushing oil, refilled with 10W40 and checked the level at normal engine temperature according to MG Rover's procedure. I'm hoping that you'll hear an improvement!
Simon
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29th May 2024, 17:52 | #5 |
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Hello Simon,
I have done an oil & filter change, drove 100 km, after that drained the oil and used 5 liters Comma Flush Out with 10-14 min. fast idle and after that again an oil and filter change using Castrol GTX ultra clean and Mahle filter. The sound is less present, but not completely gone. Guess my ambition to make it sound like a brand new motor is a bit too high. Drives great though. Thanks, Cheers from Holland, Emiel
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30th May 2024, 06:52 | #6 |
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You could always try a second treatment.
Comma's directions are just to drain your current Castrol GTX and refill with Flush Out; there's no requirement to renew the filter at that initial stage (although it would do no harm). I'm currently working on a friend's KV6 and the amount of oily paste stuck to the underside of the cam covers, particularly around the oil filler cap, is shocking. You could check yours and clean them with a solution of engine degreasing fluid. Whilst you're there, unblock the breather pinhole which is found behind one of the gauze filters. Unfortunately to do this on the right-hand bank involves removing the manifold chamber but it would help with your ambition to make your engine sound brand new again! Simon
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