7MGTE Blown Head Gasket on Cylinders 5-6 - HG Replacement with ARP Studs

Engineadvanced✓ OP Confirmed

Problem

1990 Supra Turbo 7MGTE had a blown head gasket with coolant loss. Upon teardown, the head gasket was found to be failed around the water ports on cylinders 5 and 6. Evidence of prior work (paper gaskets on turbo side) and only about a gallon of coolant remaining in the system.

Coolant loss (only ~1 gallon of coolant remaining in system)Blown head gasket visible upon teardown around water ports on cylinders 5 and 6Oil buildup on passenger side of block

Root Cause

Failed factory composite head gasket on the 7MGTE, a common failure point on these engines, particularly around the water ports near cylinders 5 and 6.

Confidence

Moderate confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted December 2020 on SupraForums.com