AIR INLET AND EXHAUST SYSTEM
TESTING AND ADJUSTING
EXHAUST TEMPERATURE
Valves Valve removal and installation is easier with use of the IP3527 Valve Spring Compressor Assembly. Valve Seat Inserts To remove and install valve seat inserts, use the 6V4805 Valve Seat Extractor Group. For installation, lower the temperature of the insert before it is installed in the head. Valve Guides Tools needed to remove and install valve guides are the 5P1729 Bushing and 7M3975 Driver. The counterbore in the driver bushing installs the guide to the correct height. Use a I P7451 Valve Guide Honing Group to make a finished bore in the valve guide after installation of the guide in the head. Special Instruction, Form No. SMHS7526 gives an explanation for this procedure. Grind the valves after the new valve guides are installed.
1P3060 PYROMETER GROUP Use the IP3060 Pyrometer Group to check exhaust temperature. Special Instruction, Form No. SMHS7179 is with the tool group and gives instructions for the test procedure.
Checking Valve Guide Bores
CRANKCASE (CRANKSHAFT COMPARTMENT) PRESSURE
Use the 5P3536 Valve Guide Gauge Group to check the bore of the valve guides. Special Instruction, Form No. GMG02562 gives complete and detailed instructions for use of the 5P3536 Valve Guide Gauge Group.
Pistons or rings that have damage can be the cause of too much pressure in the crankcase. This condition will cause the engine to run rough. There will also be more than the normal amount of fumes coming from the crankcase breather. This crankcase pressure can also cause the element for the crankcase breather to have a restriction in a very short time. It can also be the cause of oil leakage at gaskets and seals that would not normally have leakage. COMPRESSION An engine that runs rough can have a leak at the valves, or have valves that need adjustment. Removal of the head and inspection of the valves and valve seats is necessary to find those small defects that do not normally cause a problem. Repair of these problems is normally done when reconditioning the engine. CYLINDER HEADS The cylinder heads have valve seat inserts, valve guides and bridge dowels that can be removed when they are worn or have damage. Replacement of these components can be made with the tools that follow.
SP3536 VALVE GUIDE GAUGE GROUP 134
