oil Pressure guage + Speedo

Technical questions and answers
V8_Disco
Posts: 118
Joined: Tue Mar 03, 2009 1:10 pm
Location: East Yorkshire

oil Pressure guage + Speedo

Post by V8_Disco »

Hi all

Couple of small questions

I have to take the car on a big run before the Guage starts to move? is this normal?

I have fitted a Gen Stage 1 Speedo head but its underreading, i assume its got the higher gering from the Range Rover, does a similar era range rover head fit? + does anyone have one!

Aidan
1982, Stage 1 SW LPG
1999, Disco 2 4.6 Stage 1 Heads ES Multipoint LPG
1976, 88 SW
1973, 88 Truck Cab
BenS
Posts: 29
Joined: Tue May 26, 2009 10:47 am

Post by BenS »

I think the difference is in the speedo drive cog that sits on the output shaft of a range rover LT95 box. If it's any help mine reads 30mph doing 40mph. I have calculated/guessed that a 1000tpm speedo should be about right and bought one from fleabuy for less than £10 (Triumph Herald)- it fits and has the relevant holes for the lights (headlights, charge, oil pressure). I haven't actually tested it yet due to still having no brakes!
Bumpkin
Posts: 440
Joined: Sun Feb 06, 2005 8:51 pm
Location: Mid Cornwall

Post by Bumpkin »

Hi
Stage 1 V8 has the same speedo as late LWB and late Series Land Rovers.
The number is 1356 in tiny little numbers on the speedo.
Tel
1 Stage 1 V8 HiCap
1 Series 3 HiCap
1 LWB Steies 2
1 SWB Series 2
1 300 TDi Disco
1 4.6 HSE P38
1 V8 90 County
disco2hse
Posts: 1637
Joined: Sun Apr 27, 2008 3:51 am
Location: Auckland NZ

Post by disco2hse »

You sure you're talking oil pressure gauge and not temperature? If temperature, then yes, it takes longer to move than the water temperature and it cools down faster.
Alan

1983 ex-army FFR 109 Stage 1
2005 Disco 2 HSE TD5
sebking
Posts: 446
Joined: Wed Sep 24, 2008 5:23 pm
Contact:

Sender

Post by sebking »

I'd say the sender is shot.

Mine was mad - anything between 0 and 100psi depending on what it felt like. Swapped it out.

Seb
1970 Spitfire MKIII
1981 Laser 1 88643
1982 Stage 1 v8 SW
1992 Laser 2 9101 "Purple Reign"
2000 Laser Pico 4050
2001 Brompton M3L
2010 VW California GP 140 SE
2010 Brompton M6L
2010 Venture Ranger 16 Canoe
2010 Cube Ltd Pro
Larosto
Posts: 83
Joined: Thu Jan 11, 2007 2:56 pm
Location: Germany, N

Post by Larosto »

I think Ben is right. The speedo drive cog from RR and Stage One are different. I instaled a RR-gearbox, and since that time my speedo is undereading. `think the difference between the speedo cogs is two teeth or so, but I don`t know ut exactly.
My oil pressure gauche starts climbing up after the engine is running for ten or twenty seconds, but only if the engine is cold. When it`s hot, it climbs imedeatly. The oil pump is new, so I think it`s nothing serious.
Perhaps I will change the sender in the near future.

regards

Horst
disco2hse
Posts: 1637
Joined: Sun Apr 27, 2008 3:51 am
Location: Auckland NZ

Post by disco2hse »

I forgot. I do not have an oil pressure gauge, instead I have an alarm that sounds when the oil pressure drops to a critical level. This always screams loudly until the engine is turned over then it stops quickly. Cranking the engine by hand will also bring the pressure up sufficiently to stop it.
Alan

1983 ex-army FFR 109 Stage 1
2005 Disco 2 HSE TD5
V8_Disco
Posts: 118
Joined: Tue Mar 03, 2009 1:10 pm
Location: East Yorkshire

Post by V8_Disco »

It is easy to swap the cog out? It ust be towards the back of the box as the cable does not go in that far, they dont look that expensive ... certanly cheeper than 3 points and a fine!

I will have a closer look, I think it might be a case of needing a clean/swaping out engine runs fine

A
1982, Stage 1 SW LPG
1999, Disco 2 4.6 Stage 1 Heads ES Multipoint LPG
1976, 88 SW
1973, 88 Truck Cab
BenS
Posts: 29
Joined: Tue May 26, 2009 10:47 am

Post by BenS »

V8_Disco wrote:It is easy to swap the cog out?
To swap the cog involves removing the handbrake and then the rear output shaft. I took the broken box supplied with mine apart and got the cog out fairly easily. The workshop manual does mention that everything must be reshimmed when reassembled if anything (e.g. speedo drive cog) has changed. At this point I decided to go down the line of getting a speedo with the correct turns per mile rather than trash the gear box through general mechanical incompetence! I believe the shimming is to give the correct force on one of the bearings which i presume would wear quickly otherwise.
V8_Disco
Posts: 118
Joined: Tue Mar 03, 2009 1:10 pm
Location: East Yorkshire

Post by V8_Disco »

Thanks Ben

Does the RR speedo fit? do you know, I already have a RR cable as I know the connetions at the back of the speedo are differnt

I am thinking about putting an overdive on so I will have the floor up ...

Does anyone have a overdirve fitting manual?

Thanks

A
1982, Stage 1 SW LPG
1999, Disco 2 4.6 Stage 1 Heads ES Multipoint LPG
1976, 88 SW
1973, 88 Truck Cab
5988
Posts: 692
Joined: Fri Mar 13, 2009 8:57 pm
Location: Lincolnshire

Post by 5988 »

have a look on
http://www.landroverv8.com/manuals.html
second from bottom

unless you get lucky you will need to buy some shims, and may need to make/buy the stud (unless you got it with the od)
V8_Disco
Posts: 118
Joined: Tue Mar 03, 2009 1:10 pm
Location: East Yorkshire

Post by V8_Disco »

Thanks I had forgoton abouts Sebs site

Any answer out there about the 1970s RR speedo

A
1982, Stage 1 SW LPG
1999, Disco 2 4.6 Stage 1 Heads ES Multipoint LPG
1976, 88 SW
1973, 88 Truck Cab
Larosto
Posts: 83
Joined: Thu Jan 11, 2007 2:56 pm
Location: Germany, N

Post by Larosto »

Hi,

fitting an overdrive is a rather easy job, but there is one thing you should care about: The main shaft mustn`t be moved when fitting the overdrive gear, because if this happens, the thrust bearing will fall down, and then you have to remove the gearbox from the car to put the bearing in the right position. So, notice: UNDER NO CIRCUMSTANCES THE SHAFT SHOULD BE MOVED IN DIRECTION OF THE FRONT OF THE GEARBOX!!!
I know it, `cause it happened to me.

Good Luck
Horst
V8_Disco
Posts: 118
Joined: Tue Mar 03, 2009 1:10 pm
Location: East Yorkshire

Post by V8_Disco »

Thanks Horst, with my luck this will happen to me!

A
1982, Stage 1 SW LPG
1999, Disco 2 4.6 Stage 1 Heads ES Multipoint LPG
1976, 88 SW
1973, 88 Truck Cab
BenS
Posts: 29
Joined: Tue May 26, 2009 10:47 am

Post by BenS »

V8_Disco wrote: Any answer out there about the 1970s RR speedo
Think 1970s RR ran on 16/235 tyres rather than 16/750s so may again not read correctly. Don't know what tpm RR speedos are or whether they would fit.
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