[214 Eg] Exhaust Manifold; Description; Installation - Mack E7 Service Manual

5-101.bk Page 62 Friday, March 17, 2006 11:05 AM
6. Lubricate threads of the capscrews (2) and
secure the valve covers with the lubricated
capscrews. Torque capscrews to 16 lb-ft
(22 N m).
1
2
4 3
Figure 6-72 — Valve Cover Installation
1. Valve cover
2. Capscrew

[214 EG] EXHAUST MANIFOLD

Description

In March 1995, a new exhaust manifold with a
thicker mounting flange was introduced into
production on all E7 engines. The mounting
flange on this new "low-boss" exhaust is 3/4 inch
(19.1 mm) thick, compared to the 1/2-inch
(12.7 mm) thick mounting flange on the previous
exhaust manifolds. The new manifolds use
mounting studs which are 60 mm (approximately
2-3/8 inches) long, and copper-plated flanged
nuts without a locking feature.
E7 engines use a new-style exhaust manifold
gasket without the stainless steel insert around
the exhaust port opening as on previous gaskets.
Engines with the older style exhaust manifolds
must continue using the previously used
"armored" exhaust manifold gasket.
Page 6-62
200 ENGINE ASSEMBLY
If replacing an existing manifold (on engines
manufactured before March 1995) with a low-
boss exhaust manifold and reusing the long studs
(103 mm long), each stud requires a spacer.
When installing a low-boss exhaust manifold on a
pre-1992-1/2 E7 V-MAC engine with injection line
brackets fastened to the exhaust manifold,
spacer and 113 mm studs are required.
The new manifold fastener arrangements do not
require washers or lockplates. When installing
new fasteners on an engine that uses washers
and lockplates, discard those parts and replace
200355a
both with the new fasteners.

Installation

3. Actuator
4. Riser
Refer to Figure 6-73.
Exhaust manifold nuts must be installed dry (no
lubrication).
1. Install the 12 studs in position on the
cylinder head.
2. Position six manifold gaskets on the studs.
3. Position the exhaust manifold on the
mounting studs and secure with nuts.
Torque the nuts to:
55 lb-ft (75 N m) for 10 mm nuts
65 lb-ft (88 N m) for 12 mm nuts