Note: This forum is paid for and managed by the Rover-Landers of BC club. Forum registration and use is free and does not require you to join our club. However, we do encourage you to become a member and participate in our club activites. Our online club membership form is available at: Club Membership.

Disco 1 transmission whine

Post Reply
Message
Author
User avatar
bsa_m21
Winch that stole Christmas
Posts: 228
Joined: Mon Mar 02, 2015 1:30 pm
Location: Surrey, BC

Disco 1 transmission whine

#1 Post by bsa_m21 » Sun Apr 08, 2018 4:31 pm

Hi all,

For the past two months I've had a distinct whine coming from the transmission (I think) of my 96 D1. It's not overly loud, quite high pitched, and happens only while moving and not coasting, stopped or in park. e.g. If I let off the gas the whine goes away. A slight pressure on the gas pedal and it's back - even a quick blip that doesn't increase my speed - brings it on. Tranny fluid was just changed 5k ago and is still full. It was suggested to me that the transfer case oil might be low, so I checked it yesterday. It was full but a bit dirty, so I replaced it. No change to the whining.

I don't think it's the water pump, or it should do it when I rev the engine while parked. No?
I do have a slight oil leak from the main seal on the front cover and the oil pressure light stays on for a few seconds on cold startup.

Any guru's out there that might have an idea what might be causing the noise?

Thanks,

Martin
Martin
=======
Series/Disco Coiler Hybrid (build in progress)
'52 S1 - Runcle
'96 Discovery 1 - Hothead
'80 Triumph TR7v8 (Rover 4L) - Myrtle
(Roverlanders webmaster)

User avatar
rayhyland
Missing Link
Posts: 590
Joined: Mon Feb 23, 2009 5:28 pm

Re: Disco 1 transmission whine

#2 Post by rayhyland » Sun Apr 08, 2018 5:37 pm

My RRC does that. I was guessing TC or rear diff but haven’t had a chance to get into it yet.


Sent from my iPhone using Tapatalk
Ray Hyland
BCOverlandRally.com, NWOverlandRally.com
I drive a 113 (a 110 and three Series 1s)

red90
Specialist
Posts: 1329
Joined: Mon Mar 08, 2004 7:19 pm
Location: Calgary

Re: Disco 1 transmission whine

#3 Post by red90 » Sun Apr 08, 2018 6:37 pm

Does it change with engine speed or vehicle speed? Is it the same in all gears or does it change?

User avatar
rayhyland
Missing Link
Posts: 590
Joined: Mon Feb 23, 2009 5:28 pm

Re: Disco 1 transmission whine

#4 Post by rayhyland » Sun Apr 08, 2018 10:04 pm

red90 wrote:Does it change with engine speed or vehicle speed? Is it the same in all gears or does it change?
Mine is louder under load, goes away when coasting. Most noticeable at highway speeds.


Sent from my iPhone using Tapatalk
Ray Hyland
BCOverlandRally.com, NWOverlandRally.com
I drive a 113 (a 110 and three Series 1s)

User avatar
bsa_m21
Winch that stole Christmas
Posts: 228
Joined: Mon Mar 02, 2015 1:30 pm
Location: Surrey, BC

Re: Disco 1 transmission whine

#5 Post by bsa_m21 » Sun Apr 08, 2018 10:24 pm

It gets slightly louder under load. At highway speeds the tire noise is enough to mostly drown it out (big mudders). :twisted:

M.
Martin
=======
Series/Disco Coiler Hybrid (build in progress)
'52 S1 - Runcle
'96 Discovery 1 - Hothead
'80 Triumph TR7v8 (Rover 4L) - Myrtle
(Roverlanders webmaster)

User avatar
bsa_m21
Winch that stole Christmas
Posts: 228
Joined: Mon Mar 02, 2015 1:30 pm
Location: Surrey, BC

Re: Disco 1 transmission whine

#6 Post by bsa_m21 » Mon Apr 09, 2018 12:11 pm

I had a couple of replies from my query on the Discoweb forum:

"It's the transfer case, don't worry about it. Thicker oil will quieten it a little."

and

"Whine that goes away depending on gas pedal pressure means axial play by hipoidal gears. Transfer case and diffs can whine. You should check all connections to driveshafts in order to find unusual or excessive axial play."

So it looks like I should change my transfer case oil to Hypoid 90/140 for the summer.... :shock:

M.
Martin
=======
Series/Disco Coiler Hybrid (build in progress)
'52 S1 - Runcle
'96 Discovery 1 - Hothead
'80 Triumph TR7v8 (Rover 4L) - Myrtle
(Roverlanders webmaster)

Post Reply