We replace the gasket due to the appearance of a coolant or engine oil leak at the junction of the block head with the cylinder block.
To replace the cylinder head gasket, you need to remove the engine, since you need to remove the timing chain.
Access to the gas distribution mechanism on the engine installed on the car is not possible.
To complete the work, you will need tools: heads for 8, 10, 15, 16, a torque wrench, an extension cord, a knob, a set of screwdrivers, a set of flat probes, a metal ruler, a stopper for fixing a pulley.
We prepare the car for the job.
We remove the engine.
Remove the gas recirculation valve assembly with the heat exchanger.
We remove the turbocharger.
Remove the block head cover (article - Replacing the cylinder head cover gasket of the Cummins ISF2.8 engine).
We install the piston of the first cylinder at the TDC of the compression stroke (article - Installing the TDC of the first cylinder Cummins ISF2.8).
We unscrew the five bolts securing the crankcase cover of the timing drive
Remove the cover
Remove the gasket. When installing, you need to replace the gasket
Unscrew the two bolts securing the chain tensioner cover
Remove the cover
We remove the hydraulic tensioner plunger
We fix the chain by tying with a wire
We loosen the tightening of the mounting bolt of the drive disc and the camshaft sprocket, keeping the shaft from turning.
We completely unscrew the bolt securing the master disk of the phase sensor and the camshaft sprocket
After unscrewing the bolt securing the master disk of the phase sensor and the camshaft sprocket, the crankshaft and the camshaft must not be rotated so as not to disturb the valve timing.
Removing the disc
Remove the sprocket with the chain from the camshaft shank
We remove the spacer washer so as not to lose it
We fix the timing chain on the engine together with an asterisk
Removing the thermostat housing
We loosen the tightening of the bolt fastening the damper of the timing chain to the block head
And unscrew the bolt.
We unscrew the two bolts securing the crankcase of the timing drive to the flywheel housing
The location of the bolts fastening the crankcase of the timing drive
Unscrew the bolts of all the rocker arms
Removing the bolts
Removing the rocker arms
Removing the pushers
We take out the supports of the axles of the rocker arms
We unscrew ten bolts securing the cylinder block
The location of the cylinder head mounting bolts in Figure 27
We untie the camshaft sprocket with the chain from the block head and remove the head with the intake pipe, exhaust manifold and vacuum pump, keeping the timing chain taut.
After removing the cylinder head, we immediately fix the timing chain with a wire in a taut state so that it does not fall off the crankshaft sprocket.
Remove the cylinder head gasket
We inspect the mating surfaces of the head and cylinder block.
We clean the mating surfaces from the remnants of the old gasket.
We check the cylinder head for warpage.
We put a ruler with an edge on the surface of the head, first in the middle along, then diagonally, and in all positions of the ruler we measure the gap between the surface of the head and the ruler with a feeler gauge. If the gap is more than 0.05 mm, the head is replaced.
We take out the new gasket from the packaging just before installation.
We install a new gasket on the cylinder block with a sealing roller applied to the gasket upwards.
We install the cylinder head in reverse order, taking into account:
- remove oil or coolant from the threaded holes for the cylinder head bolts that got there after removing the head;
- we lubricate the bolts with engine oil;
- screw in the cylinder head bolts and two bolts for fastening the crankcase of the timing drive by hand, but without tightening;
- tighten the bolts on a cold engine in the order shown in the figure ...
The first stage - tighten the bolts to a torque of 60 Nm;
The second step is to screw in the fastening bolts 90˚;
The third step is to tighten the mounting bolts 90˚.
We tighten the two bolts securing the crankcase of the timing drive to a torque of 4 Nm.
Install all parts in reverse order.
We adjust the valve clearances (article - Adjusting the thermal clearances of Cummins ISF2.8 valves).
We install the engine on the car.