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atakanmerdin



Member Since: 15 Dec 2017
Location: Nairobi
Posts: 15

Kenya 
HELP! ZF4hp22 noises!

Hi Gents!
Someone help me identify this problem Sad
Whilst runnng in freshly rebuilt 4.2 in my 90. At highish rpm auto box suddenly let out screeching sound. Was near home so limped home. Screeches now permanently in hi Lo and neutral too. Some mechanical knocking sound too! What does this mean?
Sound is centrifugal! Increases with engine RPM. That’s to say higher frequency in N and in P.
Help this is the 3rd box she’s had Sad

Post #728664 12th Sep 2018 7:51pm
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Alex1976



Member Since: 24 Jan 2013
Location: Buckingham
Posts: 561

England 

I don’t know a lot about auto boxes (although I have one in my Defender) but I would think this would be a torque converter issue possibly.

The guru of all things ZF is Dave Ashcroft - drop him an email or give him a bell and he will probably know exactly what the issue is and more importantly how to fix it.

Post #728665 12th Sep 2018 8:11pm
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v8bob



Member Since: 14 Mar 2018
Location: Midlands
Posts: 124

United Kingdom 2010 Defender 110 Puma 2.4 USW Stornoway Grey

I have looked at a few autos in my past. My first question would be why did you replace the previous box and how long ago?
Might be worth telling me the same on the previous boxes?

Post #728667 12th Sep 2018 8:19pm
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Devon-Rover



Member Since: 22 Jan 2015
Location: South Devon
Posts: 718

United Kingdom 2014 Defender 110 Puma 2.2 USW Aintree Green

Freshly rebuilt so you recently had the engine out? just wondering if a converter bolt has come loose or it hasn't be correctly engaged into the oil pump. Also can be found on Fb, Ytube, Insta & Twitter @4WDSouthwest

Post #728673 12th Sep 2018 8:35pm
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atakanmerdin



Member Since: 15 Dec 2017
Location: Nairobi
Posts: 15

Kenya 

Was manual. Change to auto was due to fiancé as an engagement gift. Car was the gift had to be auto...
First box was duff wouldnt shift and it came with the engine. Second one too had only reverse gear (believe blown A clutch pack).
Was careful with the torque converter spacing and installation with this box and it drove well for a week shifting all through and locking up.
On high RPMs today the screeching scratching hippies started definitely a spinning sound as increases with engine speed i.e higher frequency in P and N.
Someone suggested checking “Maybe one of the torque converter bolts backed out? Check under the cover”

Post #728674 12th Sep 2018 8:35pm
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v8bob



Member Since: 14 Mar 2018
Location: Midlands
Posts: 124

United Kingdom 2010 Defender 110 Puma 2.4 USW Stornoway Grey

As you say torque converter installation was done carefully then I would assume all the bolts were fitted correctly and torqued to spec.
Screaching would suggest a bearing problem. See if you can borrow a stethoscope and find out where the noise is loudest.
If it is from the box... It is worth looking at the trans oil cooler circuit. Kinked pipes, blocked cooler, blocked pipes, plastic plug not removed. The lube circuit is generally first thing to suffer if you have a problem with the cooler circuit.

Post #728680 12th Sep 2018 9:07pm
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atakanmerdin



Member Since: 15 Dec 2017
Location: Nairobi
Posts: 15

Kenya 

Thanks will have a look. I’m almost convinced it sounds like a loose bolt and rotational scratching against metal. Maybe I just want it to sound like that...
A loose torque converter should knock? The mechanical sounds did sound like knocking around. Possible to damage flex plate on high load?

Post #728681 12th Sep 2018 9:10pm
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atakanmerdin



Member Since: 15 Dec 2017
Location: Nairobi
Posts: 15

Kenya 


What it sounds like, a lot screechier in person

Post #728684 12th Sep 2018 9:29pm
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atakanmerdin



Member Since: 15 Dec 2017
Location: Nairobi
Posts: 15

Kenya 

Bump!

Post #728687 12th Sep 2018 10:03pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 5705

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Does it still have drive? If so oil pump is working and engagement is correct

Tc bolt come out? Check through s/m hole, remove bottom inspection plate? What in there any thing unexpected?


Not something stupid like handbrake shoes? Cheers

James
110 XS Utility
90 tdci Softtop
90 tdci Hardtop

Post #728692 12th Sep 2018 10:24pm
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atakanmerdin



Member Since: 15 Dec 2017
Location: Nairobi
Posts: 15

Kenya 

She still has drive, forward and reverse. Gearing to check inspection hole.

Post #728693 12th Sep 2018 10:26pm
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atakanmerdin



Member Since: 15 Dec 2017
Location: Nairobi
Posts: 15

Kenya 

Who wants to have a laugh!
Radiator and bonnet stay rod came off mounting contacting engine front end...
Noise transmitted through whole in floor...
test driving now to fully eliminate transmission
Damage to viscous fan blades and coolant pipes.
Rover life

Post #728712 13th Sep 2018 6:35am
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v8bob



Member Since: 14 Mar 2018
Location: Midlands
Posts: 124

United Kingdom 2010 Defender 110 Puma 2.4 USW Stornoway Grey

At least it is good that you don't have to take the gearbox out Smile

Post #728715 13th Sep 2018 7:50am
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 1224

United Kingdom 1984 Defender 90 200 Tdi HT Orkney Grey

Laughing I'd rather change the viscous fan and some hoses than change the gearbox !
Mo The Land Rover 90 - Many are called, few are chosen.

Post #728729 13th Sep 2018 9:19am
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atakanmerdin



Member Since: 15 Dec 2017
Location: Nairobi
Posts: 15

Kenya 

Yes! Thank the rover gods!
And thanks to all for the invaluable and quick advise and responses!

Post #728796 13th Sep 2018 5:55pm
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