Oil weepage is not considered detrimental to this engine’sperformance or durability. An oil leak may be caused by metal chipdebris lodged between the head gasket and the block, chip debrisbetween the cylinder head and the head gasket, or by damage to thecylinder head sealing surface that occurred during the manufacturingprocess.
Once an oil leak is verified with a black light test atthe head gasket joint, replacement of the head gasket can be performed.If the head was damaged by chip contamination, the head should bereplaced. A revised “service-only” gasket is now released for both ofthese cases.
Required for service are:
•A straightedge (machine flatness toleranced to 0.0002” per foot inlength) that’s available from local tool dealers or as provided by FordMotor Company;
• Motorcraft Silicone Gasket Remover (ZC-30);
• Metal Surface Prep (ZC-31); and
• Service-only gasket (3U7Z-6051-BA for driver’s side and/or 3U7Z-6051-AA for passenger’s side) with the new embossed area.
Cylinderheads damaged by brinnelling (depression marks from original gasket) ofthe head may still be reusable. The revised “service-only” gasket has afeature by which the embossed sealing area does not follow the samesealing path as the original gasket. This area is surrounding the HighPressure Oil Feed (HPOF) area. It’s triangular in shape and is found inthe rear of the passenger’s side cylinder head, or in the front of thedriver’s side cylinder head (see Figures 1 and 2).
If performing in vehicle service, the engine should be allowed to coolbefore removing the head or warpage may occur in deck flatness.
Thecylinder head and block decks should be cleaned before performing aflatness check. Dark metal stains below the surface of the metal arenormal. Do not attempt to polish off the stains with grinders orscrapers. Use a plastic scraper (or plastic ice scraper or equivalent)to pull away any residual silicone RTV with ZC-30 and ZC-31 applied insequence.
The repair information and labor times have beenupdated for both cars and trucks using 4.6L 2V and 5.4L 2V andSupercharged 5.4L engines. These include instructions to remove theengine prior to removing the cylinder head. Labor times allow for extratime in engine removal and cylinder head deck leak repair out of thevehicle.
Cylinder head kits are available on most applicationsfrom Ford and include complete head assembly, with cam and valves; headbolts, service-only head gasket; both intake gaskets exhaust gasket;one rocker cover gasket; and one set of exhaust studs and nuts.
Ifit’s found that only one head is leaking, it’s not necessary to removethe other head. Repair only the side for which leakage occurs.
ALLDATATechnical Editor Eric Seifert is an ASE-certified Master Technician andEngine Machinist, with 20 years of independent shop and parts storeexperience.
Technical service bulletin courtesy of ALLDATA.
For additional information, visit www.alldata.com.
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