Print Friendly, PDF & Email

Article by: RobRed

Applicable Models: 1998-2007 / 100 Series Land Cruiser or LX470

Published: Monday, September 5, 2011

Last updated: October 1, 2013 at 19:43 pm

The mission: Two Land Cruisers, one three day weekend, two sets of headers.

My 2000 Land Cruiser had been suffering from the manifold leak/tick since I bought it in Feb 2011. It didn’t matter if the motor was cold or had been running for hours… tick tick tick. Not only annoying but certainly not great for the motor. Lexi4Darin had been getting his tick on the cold morning’s and would subside after a bit. We were both interested in the additional performance benefits as well and pre and post install dyno testing.  See Pre Test and Post Test.

For installation we really took our time… breaks, lunch etc. We wanted to understand the best practices for doing this so we could pass it on. We intended to do a step-by-step write for this but conceptually it’s actually simple. What makes this install difficult isn’t the techniques but rather the limiting space in the engine bay to access the manifold stud nuts. The passenger side manifold is straight forward however the driver side you need to have every kind of 14mm wrench and socket you can find to hit all the angles on the DS stud nuts – It’s crazy. If one has AHC getting around the hydraulic lines lines is treacherous.

My truck was first and took about 13 hours…figuring things out etc. Darin’s LX470 took about the same but that was because some of the things we learned on my truck were hampered by the AHC being in the way on the DS. I could do it now in about 8 hours on an Land Cruiser  as there would be no experimenting different techniques – I’d go right to it. Because we were both hands on for this project we opted not to take pictures or offer a step by step as it would be very tedious. If you have modest mechanical skills you can do this project and the actual wrench turning will be obvious. I recommend presoaking the manifold nuts as well as other nuts with PB Blaster prior to removal. These nuts have likely been in place for years and may be seized. I choose to replace all 16 manifold nuts with new. Additionally have some spare manifold studs as some will tend to back out of the head when removing the nuts. Gaskets – You should use brand new header and catalytic converter gaskets as well – you dont want to have to redo this if your old ones start leaking later. Parts from Toyota:

  • (2) Manifold Gaskets 17173-50021
  • (0-16) Manifold to Cylinder Head Studs 90126-10015
  • (2) Header to Cat gasket 90917-06065
  • (16) Header nuts 90179-10070

Before you begin any modification to your vehicle you should fully understand what you are doing and make sure you have the skills to complete the job. TLCFAQ nor it’s authors, commentors or contributors accept any responsibility, or liability for any mishap or problems from any materials posted on the website. Any and all of this can cause serious damage to you or your vehicle. Always consult a qualified professional. I’m Serious. Do this at your own risk.

Quick instructions:

Passenger Side:

  1. Jack up Truck in front.
  2. Remove both Front wheels.
  3. Remove both inside fender liners
  4. Loosen PS side Cat to manifold bolts and disco O2 Sensor.
  5. Remove PS O2 sensor.
  6. Remove PS Heatshield and throw away.
  7. Remove PS manifold.
  8. Remove old gasket at head.
  9. Clean up area and install new gasket.
  10. Install O2 Sensor into new header.
  11. Install Header on PS.
  12. Reroute O2 sensor wires and connect
  13. Bolt CAT to header, use new gasket.

Driver Side:

    1. Loosen DS Motor Mount
    2. Loosen DS side Cat to manifold bolts and disco O2 Sensor.
    3. Remove DS O2 sensor.
    4. Jack up Motor 2-3 inches
    5. Remove DS Heatshield and throw away.
    6. Remove DS manifold.
    7. Remove old gasket at head.
    8. Clean up area and install new gasket.
    9. Install O2 Sensor on new header.
    10. Install Header on DS.
    11. Lower Motor.
    12. Tighten DS Motor Mount.
    13. Route O2 sensor wires and connect
    14. Bolt CAT to header, use new gasket.
    15. Install both fender liners.
    16. Install both Front wheels.
    17. Lower truck
    18. Lift rubber AC line above DS Header out of harms way by installing zip ties and heat wrap
      • Look at the first photo below. AC line on the left – very close to header (perspective from driver side of LC)
      • Second image shows AC line zip tied to the fuel filter out of harms way (perspective from front of LC)

 

Enjoy the ride.

More info for your install:

-32 ft-lbs on the manifold bolts
-32 ft-lbs on the front O2 sensors
-14 ft-lbs on the rear O2 sensor nuts
-46 ft-lbs on the manifold to cat flange nuts
-30 ft-lbs on the cat to exhaust flange nuts
-22 ft-lbs on the engine mounting brackets to the frame brackets
-If you use the OEM gaskets, make sure the white painted marks are facing the manifold side.

—

End

Comments

comments