 | Home > Td5 > Deep rumble/drone/vibration between 1750 - 2000 ish rpm |
 
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4395  
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Interesting.
First thought: How is the harmonic balancer on the front of the engine? Second thought: Is one of your injectors started to intermittently work? You will need a nano com or similar to see the injector signal. A follow-on from the second thought is obviously the injector loom and oil in it. Probably not, but worth checking at the least. |
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26th Apr 2022 8:56am |
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| LandymanStefan Member Since: 30 Aug 2017 Location: Surrey Posts: 860  
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Not sure I have thought about the crankshaft damper. How do you check it?I know there’s the squeak check on shutdown but mine doesn’t do this.
No oil in the loom. I do have a nanocom to check the injectors but how do I check exactly? I don’t think it is the injectors because it happens exactly the same on overun as it does on a pull. If I find a hill and get speed up in second and let the revs fall through from 2250 to 1750 it still does it. |
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26th Apr 2022 10:50am |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5417 
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DMF. Iknow it’s does change with clutch operation, but it always spinning with engine. Just a thought.
Or have you tried running engine with drive belt removed, just to see if any difference |
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26th Apr 2022 4:54pm |
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| LandymanStefan Member Since: 30 Aug 2017 Location: Surrey Posts: 860
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Yes my friend suggested DMF but im not so sure. Theres no change with the clutch operation and i though the dmf starts to rattle when it starts giving up?
Is it safe to momentarily run without the drive belt? That would isolate the crankshaft damper and any of the pulleys. |
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26th Apr 2022 5:09pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16871 
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The clutch usually starts to judder when the DMF starts to fail.
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26th Apr 2022 5:37pm |
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| LandymanStefan Member Since: 30 Aug 2017 Location: Surrey Posts: 860
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On some inspection of the front pulleys the fan pulley is leaking. Done a bit of research and this is meant to be a sealed bearing so I wonder if this bearing is shot. The vibration feels bigger than just the fan bearing but I think it’s worth a shot.
 Click image to enlarge |
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26th Apr 2022 6:25pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4395
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Yes your fan bearing is shot, or close to it. As it happens I have just cleaned out and re-packed the bearing on Miffy's engine. It will last a little longer but will need replacing soon.
This is the bearing - https://www.turnerengineering.co.uk/PBSCPr...EALw%5FwcB and this is a good how to - http://www.discovery2.co.uk/Fan_bearing.html It is not a difficult job to do. Bearing is a little expensive. Before fitting make sure the bearing has enough grease in it. Prior to fitting leave it in the freezer over-night, this will it will just slot in to the front cover. Obviously, just give it a free hours to come back up to room temp before starting the engine. |
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27th Apr 2022 10:41am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4395
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The crankshaft damper will begin to squeak when turning off the engine, turning in to a clatter if really bad. The rubber internals separate from the internals of the pulley. It can lead to weird vibrations at weird RPMs. Take the belt off and give the pulley a good waggle and gently with a pry bar. Any extra movement shouldn't be there. As for the injectors. Plug in the nano com and navigate to the injector tolerance screen. Run the engine to operating temps. At idle they should all be fairly consistent. Raise the RPMs and watch whether the numbers remain similar, if any do not then that injector is the one to begin with. Start with the loom side of things. Move on to the injector seals. Then suspect the injector itself. You can swap the injectors around and see if that particular inject continues to behave irratically in its new cylinder. You will need new injector seals for each swap you do. It is not a point to the problem sort of problem, but an iterative problem. Keep ticking off what it is not. I am going to add exhaust leak in to the mix, gasket or hole in a muffler or collapsed muffler. |
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27th Apr 2022 10:52am |
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| LandymanStefan Member Since: 30 Aug 2017 Location: Surrey Posts: 860
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Thanks for the write up geo.
Ordered the fan bearing bits last night, hopefully they will arrive in time for the weekend. My mrs is back from a few days away so I’ll treat her to an evening of revving the truck while I go round trying to hear where it’s coming from. The truck is due a service so I think I’ll crack on with that first, then I check the injectors with the nanocom as you said. Finally when I come to do the bearing I think remove the belt and check all the pulleys by hand for any play while I’m there. As for the exhaust it’s not impossible but the exhaust is in fairly good nick. I may check the mounts in case something has come loose or it resonating. Could be an excuse to buy a demand system. 
Really hoping it’s just the fan bearing at this point. |
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27th Apr 2022 1:32pm |
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| LandymanStefan Member Since: 30 Aug 2017 Location: Surrey Posts: 860
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Have just been underneath to check uj’s and grease the props. While I was under there I noticed my water pump has been leaking so this again could be another source of the noise. Another job to add to the list.
Click image to enlarge |
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28th Apr 2022 6:18pm |
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| LandymanStefan Member Since: 30 Aug 2017 Location: Surrey Posts: 860
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So the mystery continues. I did a few greenlanes yesterday and after a session offroad the vibration rumble stops. Then after about 10 minutes back on the tarmac it comes back. This happened 3 times after each lane. Beginning to think its a mounting issue rather than an engine fault.
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1st May 2022 8:34am |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5417
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Ahhh. It’s just objectionable to being on roads. It wants to play.
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1st May 2022 10:32am |
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| LandymanStefan Member Since: 30 Aug 2017 Location: Surrey Posts: 860
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Hey all thought I would update you all.
So after changing the water pump, fan bearing and fan belt there was no improvement. The rumble continued to get worse and began starting at lower rpm’s 1500+ It then became so bad it was undriveable couldn’t even see in the mirror it was vibrating so much. Bit the bullet and bought a LOF single mass flywheel kit. Changed it. Job done fired her up last night and she’s as smooth as silk. Click image to enlarge |
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18th May 2022 10:51am |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5417
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Good news it’s sorted.
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18th May 2022 9:12pm |
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