Discovery td5 issues

[marcus]

Hi All, New member, have owned my 1999 disco a few years now 289ks and starting to have too many problems. The main cause this year is exhaust manifolds. Fixed or replaced 5 times this year. Vehicle booked in tomorrow for a full 3" high flow system with mandells to help get rid of excess head heat. These problems are only 3 years in the making only since installing big chip upgrade 40%. Needed to tow 3.7 to 3.9 tonne boat.
If any members have experience with this would be very interested.

[Slunnie]

I think that you will find the chip and towing to be the root of the problem. EGT's are high, and I'm not sure that 3" is the solution. I'd be looking to tune it down if everything else is in order.

[sniegy]

Did u also do the intercooler?
This can help to keep the EGT's down also.
40% increase is a huge jump, especially if u havent done the IC.
As Slunnie has said u may want to try & reduce the power output & go milder.
Cheers.

[scarry]

An EGT guage is what you need.As said this is probably the source of your problems.

If you can keep the EGT's within reasonable parameters,your problems should dissapear.:)

[Blknight.aus]

did you mod the manifold, theres 2 mods you need to do to it and 1 to the head to replace the studs and it will never happen again.

1. oval grind the webs on the manifold between the ports
2. elongate the mouting stud holes on the manifold in the horizontal plane except for the center most holes

3. helicoil the head for the size studs that you have...

it also helps to use cone washers under the nuts to locate the manifold.

[pohm66]

Hi Marcus,

I assume you probably have an auto.... just wondering if you also require additional transmission cooling towing that sort of weight.....

[marcus]

Hi Marcus,

I assume you probably have an auto.... just wondering if you also require additional transmission cooling towing that sort of weight.....
pohm66
No it's a manual. The weight is a challange in starting especially in heavey brisbane traffic. Don't have sway bars on trailer as braking system is mounted on the yolk. 70 mm tow ball and big trailer helps. and nurse it. The adventure ends getting home in one piece and without breakdowns.
An example driving thru Dalby end of October. circlip holding fan and bearing onto shaft decided to give up, fan moves forward, belts comes off, belt tensioner becomes distorted and 5 days spent waiting on parts. Only to be redone back at home because the job was not done correctly. More $$$$.
That was 2weeks ago. This week new exhaust, and hopefully remapping.
The love affair continues. But I still love my Disco.:D

[Piddler]

Sounds like you have a unsuitable car for the job

I would buy a smaller boat must be a PIA to handle. (Or an F Truck to to it).
A mate of mine just purchased a F650 to oe his race car its a treat.

Good Luck with It

[justinc]

Sounds like you have a unsuitable car for the job

I would buy a smaller boat must be a PIA to handle. (Or an F Truck to to it).
A mate of mine just purchased a F650 to oe his race car its a treat.

Good Luck with It

Marcus, Piddler hit the nail on the head here. If you are caught by transport towing a 3.9t boat with a vehicle that has a 3.5t tow capacity, you are in for it. But MORE IMPORTANTLY, you have NO INSURANCE as this vehicle is not legally allowed to tow such weights.

Buy a 130DC, they are rated to 4ton, or do what a customer of ours did, bought a 4x4 Isuzu dual cab truck to tow his 4ton boat, previously dragged with his P38a. The NEW isuzu truck, including a steel tray and ON THE ROAD cost him $3k less than a new Toyota L'cruiser:o(And is twice the vehicle IMHO)

JC

[Graeme]

pohm66
No it's a manual. The weight is a challange in starting especially in heavey brisbane traffic.
Do you use low range in traffic?

[Graeme]

Marcus, Piddler hit the nail on the head here. If you are caught by transport towing a 3.9t boat with a vehicle that has a 3.5t tow capacity, you are in for it. But MORE IMPORTANTLY, you have NO INSURANCE as this vehicle is not legally allowed to tow such weights.

Yet my 84 RRC can legally tow 4T!

[justinc]

Yet my 84 RRC can legally tow 4T!

Did you get it 'uprated' Graeme? The reason I ask is that yes, 6ton with a braked trailer off road is a spec for RR's, but I don't think transport in this country recognise any of these figures. AFAIK it is still 3.5t and 4t OFF road with coupled brakes and not to exceeed some low speed, I think 40Km/h?

The problem here is not what the rangie/ disco CAN do, it is what it is ALLOWED to do within the law. :mad:

JC

[Graeme]

Did you get it 'uprated' Graeme? The reason I ask is that yes, 6ton with a braked trailer off road is a spec for RR's, but I don't think transport in this country recognise any of these figures. AFAIK it is still 3.5t and 4t OFF road with coupled brakes and not to exceeed some low speed, I think 40Km/h?

The problem here is not what the rangie/ disco CAN do, it is what it is ALLOWED to do within the law. :mad:

JC
The handbook states 4-wheel trailers with coupled brakes - max 4000kg on road and 1000kg off road, as long as local regulations are complied with. I understand that these days, in NSW anyway, the limit is the manufacturer's limit.

Edit: My 76 had the 6T at a slow speed (probably 40kph) but I don't have that book anymore.

[harlie]

Easy solution – Buy a bigger boat, one that doesn’t come on a trailer…
my old pre ABS Disco1 one was also 4000kg manufacture’s spec, and QLD rules state
(Quote QLD Transport)

Ensure that the lower of the following is not exceeded:

the maximum towing capacity of the motor vehicle as specified by the vehicle manufacturer;

or

the capacity of the towing apparatus fitted to the vehicle.
Note: This information can be obtained from the owner’s manual or the manufacturer. If the motor

vehicle manufacturer has not specified a maximum towing capacity or it cannot be identified, the
following is taken to be the maximum towing capacity for the purposes of the above:


one and a half times the unladen mass of the motor vehicle if the trailer is fitted with brakes; or


the unladen mass of the motor vehicle, if the trailer is not fitted with brakes.
Please note that

all trailers over 750 kg GTM, irrespective of the towing capacities or unladen mass of

the vehicles to which they are attached, must have brakes fitted (see Braking systems).
(end Quote)

So (in QLD) 4000kg for a RRC is OK, and 3.7 – 3.9t with a D2 is going to get expensive sooner or later, any ½ awake officer will notice the 70mm ball and instantly recognise that you know you’re over, can’t even play the "I didn’t realise" card


I actually find it interesting that there is a number of people pointing out the insurance problems faced here (Myself included) but it’s encouragement that greets the "oversized tyre" questions…:eek2:

[marcus]

Hi all and boy did I open a can of worms. That was not my intention. So I will answer a few. I really treat my Disco well, yes all heavy loads are tricky just starting and stopping smoothly. Being mindful of clutch still the original one. The trailer That I tow is a Mackay 4t, 780 tare with landcriuser wheels 15", and running gear. Electric over hdy. and 4 wheel disc brakes plus breakaway. Boat and trailer fully legal and inspected in Vic and Qld. Total weight leaving home on a long trip, say Mackay the total mass weight can be 3.4 t, Extras carried in the 7 seater. But on the way home there is always left over fuel, water, food and memories. I have spent alot of time and effect to achieve this. Buy a bigger boat, Well when the family becomes self sufficent that will happen but for now a trailer sailor is what I got.
On the operating side, 1st gear is a lot taller than most other 4x4 that I have owned. Low range for the first few changes then back to high range 1st. Never a problem. My original question was about exhaust manifolds, with the new exhaust and the manifold work carried out thanks to BLKnight---a big thanks, am yet to clean out the intercooler but is on the list. To all that have replied THANKs it was worth to join your site.
Marc