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I am replacing the head gaskets in a 98 discovery
Car: LandRover, Discovery LE, 1998, 4.0 V8i - Back to Fix-It
Q.I am replacing the head gaskets in a 98 discovery and am currently at the putting everything back together stage. I have searched high and low for the torque specs for the head rocker arm and exhaust bolts but am not having much luck. Could you please help me with this information thank you!
Answer Here are the specs for the engine
The exhaust is:
Exhaust Manifold Bolts 20 Nm (15 ft. Lbs.)
Addition So I am helping my bro-in law with this project and I feel that there are certain things that should be done while we have the vehicle this far apart. For example they received an entire head kit which included all new seals for the rocker assembly, valves, possibly the fuel injectors, I really don't know what all it came with there is just alot of o-rings and copper washer looking things. It didn't come with a breakdown of what was included and my brother in law doesn't know either.
I have about 15-20 years automotive experience but mostly in American made and pre 1990's along with heavy equipment repair. And my brother in-law is the change your oil every year or so type. I have been trying to convince him that since we have the parts and it is already mostly apart that we need to replace all that we can and he insists that just because someone looked at it and told him not to worry about changing that stuff we shouldn't do it. And because when they were cleaning the rocker arm assembly diesel flowed thru it easily it is clean enough for it to go back in without taking it apart and thoroughly going thru it and replacing the seals and what not. That has been his outlook on it all and I am concerned that its just going to go to crap in a matter of 6 months or sooner. Could you please help me protect my brother in-law from himself and tell us what your honest opinion is in this situation. Also I didn't see on the spec list torque amounts for the intake.
Thank you very much for taking the time to help us out.
Answer I am of the school that the parts were included in the kit because you need them otherwise they would leave them out and pocket the savings. There will be some seals and parts that are extra as they fit other applications but if I run across a seal or part and have a replacement I install it. You are correct that building an engine is meticulous work and it is very easy to overlook steps that will affect the longevity of the job.
You can chalk this off to a learning experience and plan on redoing the job correctly the next time, experience is the best teacher and sometimes we have to learn the hard way.
The intake specs are
Refit
Ensure all mating surfaces are clean.
Fit TP sensor. Ensure drive engages correctly with throttle spindle.
Position clamp plate. Secure TP sensor with bolts. Tighten to 2 Nm .
Using a new gasket, fit IAC. Secure with bolts. Tighten to2.3 Nm .
Ensure mating faces of water jacket and plenum chamber are clean.
Using a new gasket, fit water jacket. Secure with bolts. Tighten to 13 Nm .
Position throttle linkage bracket, fit and engage return spring.
Secure linkage bracket to plenum chamber with bolts. Tighten to 8 Nm .
Remove cloth from ram housing.
Ensure mating faces of plenum chamber and ram pipe housing are clean.
Position plenum chamber. Connect coolant hoses to water jacket. Secure with clips.
Remove clamp from coolant pipes. Remove cloth.
Apply a thin, uniform coating of Loctite 577 sealant to sealing face of plenum chamber.
Fit plenum chamber.
Fit plenum chamber bolts. Tighten to 24 Nm .
Connect multiplugs to TP sensor and IAC.
Connect breather hose to plenum chamber.
Fit kick down cable to abutment bracket and fit locknut.
Connect throttle cable to abutment bracket.
Connect vacuum hose to actuator.
Align throttle cable to lever. Fit clevis pin. Secure clevis pin with split pin.
Align kick down cable to lever.
Fit clevis pin and secure clip.
Connect intake hose and secure with clip.
Reconnect battery negative lead.
Top up cooling system.
Good luck with your brother.
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