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Cost: $300 or more....
Difficulty:
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After two days at the Mosport track, I discovered some oil
in the coolant. My headgasket failed. This procedure work
for all Bmw M30 engine: 535i, 735i, 635i.
First of all, find a good shop to work on your cylinder head
and buy a Bentley manual.
Symptoms:
• Oil in the coolant.
• White residue in the oil cap or oil stick.
• Heavy white smoke (with a characteristic smell) at
the muffler
• Oil leak at the location of the headgasket
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| Procedure |
- All kind of wrenches and sockets
- Torque wrench + angle torque meter
- 14 new cylinder head bolts
- Gasket kit
- Injector o'rings (except if you change them)
- 2 x fender covers
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- Gasket remover tool and spray
- Throttle body cleaner
- Engine cleaner
- BMW coolant
- Oil + oil filter
- Good quality rags and air pressure.
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Optional:
Vacuum hoses, fuel pressure regulator, cooling hoses, injectors,
rotor + cap, spark plugs, starter, thermostat. Check the
compression to see if you need a new engine...
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| 1. Following the bentley manual procedure, remove
everything out of the way and remove the cylinder head. I wanted
to remove the head with the exhaust manifold, but the bolts
to the exhaust line were rusty so I left the manifold in the
car. I removed the head with the intake manifold |
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2. With the head out of the car, remove the fuel
rail, the injectors, intake manifold.
3. The cylinder head and intake
manifold will be sent to a performance shop for ports
enlargement, polishing and matching to the intake
manifold. The valve guides will be changed and the cylinder
head tested.
4. The intake manifold will be powder coated black. |
5. Now you will have some time to clean all the
different parts that are out of the car, injectors, throttle
body...
6. Clean the top of the piston with a gasket scraper and the
gasket surface. You must clean the holes in the
engine block and remove any oil and water in those bolt holes.
Cracking of blocks is common if the oil is not removed from
the bottom of the bolt holes. |
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7.Put the fuel rail, injectors with new seals,
throttle body and intake manifold back on the cylinder head,
then place the head back in the car.
Unlike the picture, don't put the thermostat housing back on.
It will be placed on the car when the timing chain housing will
be in place.
Off course while the head was at the shop you clean every single
item that goes back onto the engine. |
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8.Once everything is connected (please double check), torque
the head to the specified values:
Add 50% BMW coolant and 50% distilled water then bleed the
cooling system. Let the engine run 25min then torque the head
35 + 5 degree. (It will be warm).
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Good links:
• Head
Porting for the Do-It-Yourselfer
•
M30 Head rebuidling
• Email Gordon
for Powder coated parts.
Basic Head Modifications:
1. Intake and exhaust ports enlarged and shaped for max gas
flow.
2. Combustion chambers contoured and smoothed for most efficient
combustion.
3. Valve pockets relieved for max gas flow and valve seats
ground to a precise 3-angle racing seat.
4. Entire head cleaned and stress-relieved.
5. Head-to-block surface milled true and head ports matched
to manifold ports.
6. Chambers cc'd to equal volumes and domed for piston clearance
and polished.
Optional Head Modifications for Racing
Engines:
1. Valve guides chamfered flush with port walls.
2. Oversized valves installed and oversized valve seats installed.
3. Enlarge valve spring recesses to accept larger springs
and shim valve springs to the correct installed height.
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(Thanks to Bill Rickard) 
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