5/1/2002
Chrome Plated Intake Valve Stems For 1993-2001 Navistar Dt408, Dt466/466e And 530/530e Engines
Engine Builders: The AERA Technical Committee offers the following information on chrome plated intake valve stems for 1993-2001 Navistar DT408, DT466/466E and 530/530E engines. The revised intake valves are introduced as a product improvement for increased durability and are suggested for use any time the cylinder head is serviced.
To reduce the valve stem wear of intake valves for these engines, the method of chroming the stem has been revised. The new valves are fully chrome plated as opposed to flash chromed (the difference is thickness: flash chromed is typically .0002˝ thick; fully chromed is .001˝ or more thick). The part number (suffix) of the new intake valve has been advanced (C1 to C2) to recognize the change.
It is important to note that this change applies only to the intake valves as the exhaust valve has always been fully chrome plated for reduced stem wear.
The service part number (suffix) of the cylinder head assembly is also advanced (92 to 93 and 94 to 95) to include the revised intake valve chroming process.
The following new part numbers are designed for the following applications:
•1824642C2 – Intake valve for DT408, 530 and 530 engines.
•1824695C93 – Cylinder head assembly with valves DT408.
•1824639C93 – Cylinder head assembly with valves DT466 and DT530.
Electronic engines:
•1823875C2 – Intake valve for DT466E and DT530E engines.
•1823882C95 – Cylinder head assembly with valves DT466E-530E.
Aftermarket valve manufacturers supply fully chromed valves for these engines.
Engine Builders: The AERA Technical Committee offers the following information regarding the correct oil filter for 2001-2002 GM 6.6L VIN 1 Duramax diesel engines. More than one filter will fit this engine.
The correct oil filter is GM p/n 97214983. This oil filter was designed specifically for use on the Duramax 6600 engine and incorporates improved filtering and an integral oil bypass valve.
Aftermarket suppliers offer a filter for this application as well. Verify those filters’ capabilities and designs before considering their use for this engine.
Notice: DO NOT use an AC Delco PF1218 oil filter on this Duramax 6600 engine. The AC Delco PF1218 will physically fit the engine, but does not have an integral bypass valve.
Engine Builders: 1993-2001 3.0L V6 Lexus/Toyota engines have a tendency to form cylinder head sludge deposits that restrict the flow of oil from the heads to the oil pan.
Symptoms will include oil consumption (overwhelmed valve stem seals, PCV), exhaust smoke and time/temperature dependent dipstick oil levels.
Some AERA members report that repeated oil flushes and changes may be a temporary remedy for affected engines. In addition, much more accelerated oil change intervals may be required, perhaps as often as every 1,000 miles, to prevent the sludge from reappearing.
Engine Builders: The AERA Technical Committee offers the following information on cylinder head replacement for 1997-’98 Ford 5.4L VIN L truck engines.
AERA members have reported that Ford service replacement heads with a casting number of F75E-6090-C20A may not match the cylinder head it is replacing. This head is called the non-improved horsepower head. The same casting number used by the replacement head was used in production line vehicles during these model years.
Caution: The service head requires a taller valve spring. You cannot reuse the 1997-’98 valve springs. You must update to the 1999 valve springs when using this head.
The intake manifold gasket must also be updated to the 1999 model year gasket.