Cylinder Head R & R Reference Photos
(Click pix for big pix)
Fuel Distributor
Pictures before and after.
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Upper Intake Manifold
Pictures before and after.
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Lower Intake Manifold
Pictures before and after.
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Throttle Body (before & after cleaning)
The throttle plate and throat were very gunked up. It moved fairly freely
though. I cleaned the all the vacuum ports too. I did not remove the
throttle switch, just cleaned it's in place. I did check the switch with a
meter before and after (Wide Open & Fully Closed)
Top |
Bottom |
Air/Fuel Mixture Unit
This is a view of the inside of the airflow meter (Fig-AF1). The rubber
airguide is secured to the bottom of the airflow meter by an aluminum ring and
15 bolts. Fig-AF2 shows the even space around the airflow meter plate and
airflow throat. If this is not centered the airflow plate will bind.
Fig-AF1 |
Fig-AF2 |
Head
Heads came back from Atlantic Enterprises cleaned and pressure tested (no
problems). The head surface had to be welded and ground where some corrosion
made it's way through the head gasket within the fire ring. Other areas
where the corrosion caused pitting was filled with JB Weld and milled (Fig-H1). All
guides were replaced. One guide was so loose that the oversized hole had
to be repair. All valves and seats were 3-way ground and lapped. All
valves were in excellent condition and no needed replacing. Rotators were
cleaned and oiled. New valve stem seals were installed. One spark
plug hole (#4) was heli-coiled.
Fig-H1 |
Fig-H2 |
Fig-H3 Before |
Fig-H4 After |
Fig-H5 Before |
Fig-H6 After |
Manifolds
I also had Atlantic sonic clean all the manifolds and bead blast the exterior of
the exhaust, which I will have powder coated. Bob had said the gunk in the
bottom of the lower intake took several cleanings before to get it all
out. Fig-M9 is the end of the EGR tube that was totally clogged with
carbon, this end goes into the lower intake.
Figs-M10-13 are the Exhaust Manifold Cross-Over system. M10 is a view from the
front, M11 from the rear, M12 is the right side coupling and M13 is the left
coupling. The unions are secured with stainless steel clamps with a copper
foil gasket in between. Note I don't show the forward halves of the left
and right manifolds, which are joined by a stainless steel flex coupling (see
Fig-M1).
Fig-M1 |
Fig-M2 |
![]() Fig-M2a (after PC) |
Fig-M4 |
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Fig-M5 |
Fig-M6 |
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Fig-M7 |
Fig-M8 |
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Fig-M9 |
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Fig-M10 |
Fig-M11 |
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Fig-M12 |
Fig-M13 |
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Cam Timing
The following are pictures of cam timing before the head repair and
after. Measurements (FigC1-C6) were taken at 5 degrees after top
dead center. FigC7-C9 are at TDC. Note: Fig-C8 shows the right cam
being about 8 degree late after the head repair. I assume it's so far off
because the heads were milled (left about .0035" and right about
.006"). When the heads are milled cam is lowered by the amount milled
off, this in turn adds slack in the timing chain, which is take up by the TC
tensioner. MB makes special woodruff keys that are offset by different
degrees to bring the cam timing back it spec.
| Cylinder | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Before head repair | 160 | 185 | 170 | 160 | 175 | 177 | 175 | 175 |
| After head repair | 165 | 180 | 165 | 160 | 175 | 175 | 175 | 180 |
| After rt cam timing adj. of 8º (4º cam offset) | 170 | 180 | 175 | 175 | - | - | - | - |
Note: Cylinder compression measurements Before & After. Measurements taken with engine at operating temperature.
Crank Position Sensor
Fig-CP1 w/cover |
Fig-CP2 w/o cover |
Cam Oiler Pipe
These little plastic pieces are often the cause for premature cam & rocker
arm failure. They get very brittle and break with age, not allowing oil to
shower down on the cam lobes. When checking the cam for obvious
wear, check that these plastic holders are not cracked or if in doubt replace
them. They are cheap from MB.
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Tools
Fig-T1 shows the required "U" body 8mm Allen wrench (Sir Tool
M0013) necessary to properly torque the cylinder heads. The top 4
head bolts are under the camshaft and since the cam bearing tower lower bolts
are also head bolts, the cam must be in place before you start torquing the
head..
Fig-T2 shows the various tools I found useful in removing the cylinder head
bolts, 8mm "U" body, 8mm long handle allen wrench, a fixed 8mm allen
socket (not allen socket with interchangeable bits), various length extensions,
1/2"-3/8" adaptor and 1/2" breaker bar.
Fig-T3 shows the MB valve spring compressor.
Fig-T1 |
![]() Fig-T2 |
![]() Fig-T3 |