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McLaren Artura Engine Oil Leak Diagnosis Guide – Oil Cooler
Document Information
Location: Powertrain
Topic: McLaren Artura Engine Oil Leak Diagnosis Guide - Oil Cooler
Condition: N/A
Diagnostic Trouble Codes: N/A

Measure
If an Artura is found to have a leak from the oil cooler area (oil or coolant), Please follow the steps below

1. Raise vehicle on ramp as per McLaren Service Portal (MSP) instructions
2. Remove engine underfloor
3. Capture images prior to any cleaning, clearly showing the leaking area. Label images: “Pre-Cleaning”
4. Take picture of engine number and label image "Engine Number"
5. Clean area thoroughly using degreaser/solvent
6. Add engine oil dye to the engine - Please refer to latest update of KA-01458 for correct dye and torch to use
Care Point: Do Not use leak detector spray / chalk spray
7. Start engine and run at increased idle speed (3,000 rpm) using engine oil check procedure until procedure is complete
(this will ensure that the engine oil temperature reaches 90°C)
8. Turn off engine and allow car to stand for 20 minutes on the ramp in preparation for inspection
9. Inspect engine. Capture images and label images "Cycle 1", clean area again thoroughly, capture images and label images
"Post Cycle 1"

Care Point: If there is a clear and active leak after step 9, please stop the warm up cycles and submit a TR with supporting
images/video
10. Complete warm up/cool down cycle and inspection a further 4 times capturing images. Name image folders respectively:
"Cycle 2" & "Post Cycle 2 (after cleaning)"
"Cycle 3" & "Post Cycle 3 (after cleaning)"
"Cycle 4" & "Post Cycle 4 (after cleaning)"
"Cycle 5" & "Post Cycle 5 (after cleaning)"
Care Point: In case of uncertainty on final assessment, please update TR with supporting images correctly labelled
Care Point: If no further oil leak is observed, then the initial oil residue is potentially due to excessive oil used in the build
process
11. If there is obvious evidence of an oil leak from the oil cooler after the 5 cycles continue to step 12. If no leak is present , carry out
road test (including EV mode), recheck for leaks. Capture images and label "Post Road Test" (before cleaning)
Care Point: If no further oil leak is observed, then the initial oil residue found previously is due to excessive oil used in the
build process - No further action required
12. Identify the location of the oil leak using a UV light
Oil Cooler – Cylinder Block Joint
If there is a leak identified, proceed to the next step.
13. Follow the MSP instructions to drain the oil from the engine
Care Point: The engine oil MUST be FULLY drained before continuing
14. Remove the Oil Cooler bolts recording the crack off torque & back-to-mark (BTM) torque
If the digital torque wrench used does not have crack-off torque capability, then only record BTM torque by following this procedure:
Mark the bolt
Untighten/crack-off by ~30°
Tighten back to mark (smooth and slow movement) and record the torque
15. Remove fixings for oil cooler
16. Remove oil cooler with o rings ensuring the o rings are kept with the cooler in their respective positions. When returning
thecooler and o rings these should be packaged/labelled in their respective positions. Mark bolts as per their position when
fitted to the cooler
17. Inspect oil cooler face, and through holes escalate any concerns for review on TR providing images Example:

18. Inspect block interface for RTV Squeeze out, escalate if concerned with squeeze out on TR to the Technical Support team
Example of clean face vs high squeeze out:

19. Check the block threads, are these clean and the bolts have not been fitted cross threaded/damaged?
Example:

20. Measure cylinder block o ring recess using the document attached in the link Measurement of Cylinder Block
21. Submit a TR with a description of your findings and supporting images labelled "Oil Cooler"
22. Replace oil cooler seals with seals advised by Technical Support ensuring new seals and new bolts are used as per
MSPinstructions

Repair Validation:
With the floor panel removed, follow Steps 1 to 9 to validate that no leak is present anymore
Once this test has been successfully completed (no oil leaks), rebuild the vehicle as per MSP instructions
After performing the engine health checks and a road test, return the vehicle on the ramp and inspect for any leakages
Remove the engine underfloor to check and confirm that the repaired area has remained dry

Parts Information
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Attachments
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This document is uncontrolled when printed. Before use, check the Knowledge Base within the McLaren
Retailer Portal to verify that this is the current version.