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28th May 2020, 21:06 | #1 |
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Rover 75 saloon Join Date: May 2019
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KV6 Tick
2nd post in day seems like I'm not having much with my 75
The past few weeks the car had developed a tick on start up I thought it would be the tappets but it started getting worse it lasted longer than few seconds sometimes a couple of minutes so I bought a can of seafoam threw it in and for a day the noise did come back but today it did again this morning so I'm starting to think that perhaps it's not the tappets the noise seems to be coming from drivers side rear but I couldn't pin point it. It does come up with revs but it's more prominent on idle. Also the engine is very smooth and feels completely normal even when the tick is present which baffles me even more. I'm going to include a video it's not the best as it's from the cabin but you can hear the sound https://youtu.be/7W_-TpM6Iqk Thanks in advance Last edited by thanos.m; 28th May 2020 at 21:16.. |
28th May 2020, 21:58 | #2 |
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Just to add a few things that I forgot to mention I use Mobil 1 0w-40 and that sometimes turning on the ac seems to quieten it down
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28th May 2020, 22:17 | #3 |
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Sounds exactly the same as mine did. I used hydraulic lifter cleaner which seems to have cured it for the last 3 months.
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28th May 2020, 22:30 | #4 |
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Seafoam is exactly that it's quite popular in the us with a lot vids online of it curing valve tick but you're meant to drive about 100-200 miles for it to work and then changing the oil I've only done about 40 miles since putting in so may have not worked yet but I'm thinking if it's any of accessories making the noise or belts or manifold
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29th May 2020, 08:53 | #5 |
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Could it be the 'Slack Tappet Simulator' (STS) as I call it?
Click: https://the75andztclub.co.uk/forum/s...rchid=17845112 Contrary to RAVE, the STS often occurs within seconds of a cold start (especially when the engine's not been run for a while and the fuel vapour cannister is saturated). The tapping follows the engine revs and will persist for quite a while. It's part of the emissions control system and and is quite harmless. TC |
29th May 2020, 09:37 | #6 | |
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30th May 2020, 11:25 | #7 | |
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30th May 2020, 10:34 | #8 |
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Hello Thanos,
0W40 is not recommended by MG Rover for any 75/ZT engine. For the KV6, 10W40 is listed so I suggest that you first change to that grade which is perfectly satisfactory for our climate. Your hydraulic tappets certainly shouldn't be contaminated with your oil change regime of every 3,000 miles but the presence of the noise for a period from a cold start could point to the extremely low viscosity oil you're currently using. So I'd start with an oil change as you mentioned, but to 10W40 semi-synthetic. You should have plenty of money left over for a bottle (or two) of good wine! Simon
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30th May 2020, 15:09 | #9 |
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I think I solved the mystery I think it was simply low on oil I know it sounds stupid but the dipstick showed full and yes I was following mgr procedure and I was on a flat surface I think kv6 dipsticks can't be trusted I drained about 4l oil plus some on the floor out I also did drain the oil filter on my drain tub by piercing it at the bottom just to be sure. If anything 0w-40 will lubricate the tappets quicker than 10w-40 besides that that's what Mobil recommends for the 75 and I've seen other kv6 owners suggesting it but let's not start an oil dispute. I'll see how the car behaves now and I'll report back!
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30th May 2020, 15:19 | #10 | |
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A bit of string with a weight on the end would probably be more accurate! |
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