Troubleshooting and repair of the GAZ-3110 cylinder block
To determine the technical condition and repair of the cylinder block, remove the engine from the vehicle (see "Removal and installation of ZMZ-406 GAZ-3110") and disassemble it.
Remove the cylinder head (see "Replacing the head gasket ZMZ-406 GAZ-3110"), the crankshaft (see "Crankshaft ZMZ 406 GAZ-3110"), the connecting rod and piston group (see "Dimensional groups of pistons and cylinders for the ZMZ-4062 engine"), oil sump and oil pump (see "GAZ-3110 oil pump"), as well as all attachments.
Inspect the cylinder block. If cracks are found, replace it.
Check the tightness of the cooling jacket of the unit by crimping: plug all the holes in the unit with wooden plugs, except for the one to which the compressed air supply hose is connected (You can also use rubber and plastic plugs of a suitable size) .
Immerse the unit in a bath of water and apply compressed air at a pressure of 1.5 atm.
Air bubbles will come out in places with broken tightness. If a leak is found, replace the block.
In the same way, check the tightness of the oil channels of the block.
Inspect the cylinders. If there are scuffs and other defects on the cylinder mirror, bore the cylinders to the repair size and honing.
There are two overhaul cylinder sizes shown in the table. Pistons and piston rings of the corresponding repair sizes are supplied as spare parts.
Note. All cylinders must be bored to the repair size, even if defects are found in only one.
Check the clearances between the cylinders and pistons.
The nominal gap is 0.024-0.048 mm, the maximum allowable gap is 0.25 mm.
Cylinders and pistons are divided by diameter into five size groups: A, B, C, D, e.
The cylinder group letter is inked on the left outer side of the block opposite each cylinder.
The clearance can be determined by measuring the piston and cylinder diameters.
The piston diameter is measured in a plane perpendicular to the piston pin axis, 8.0 mm below the piston pin axis. the diameter of the cylinder is measured in at least three belts within 15-100 mm from the upper surface of the block (in two mutually perpendicular directions).