Infiniti Engine >> STUBBORN CAM CAP BOLTS ON 4.5L VIN N ENGINES

Infiniti Engine >> STUBBORN CAM CAP BOLTS ON 4.5L VIN N ENGINES

Stubborn Cam Cap Bolts On
1990-96 Infiniti 4.5L VIN N Engines


AERA members have expressed difficulty removing the
camshaft cap bolts on 1990-96 Infiniti 4.5L engines.
This difficulty raises concern when it is encountered
while attempting to remove the first bolt, as there
are a total of 48 bolts used. To compound this
problem, the bolt size is small and the bolt head is
an external TORX(R) type.

AERA members have reported socket breakage while
attempting removal, as these smaller tools have
limited integrity. Apparently, these bolts have taken
a set, as assembly torque of the bolts is a minimal
10 ft. lbs. These bolts had sealer applied at the
factory and, in some instances, excessive amounts may
have been used. This sealer is actually locking the
bolt shank above the threaded area and the head of the
bolt.

To facilitate removal of these bolts several methods
have been used. Using an impact driver and impact
socket has been the most effective. The impact driver
uses a shock method to break the bolt loose. Once
loose, removal is easily accomplished. One member has
indicated a sharp wrap with a hammer and blunt end
punch has worked for him. Of course, removing the bolt
head by using a grinding or end mill is also possible
for the most stubborn bolts.

Before installing the caps, position each camshaft so
their locating dowel pin is at the 12 o'clock
position. Then, install the camshaft cap mounting
bolts and torque them to 10 ft/lbs using the sequence
shown in the illustration below. Do not use any sealer
on bolt threads, use a light application of oil on the
threads and bolt head mating surface.

The AERA Technical Committee


April 1998 - TB 1558

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