Reassembly

Now for the fun stuff, reassembling. Before doing that, you measure to check limits. Even if the parts are new you measure to make sure the parts are within limits. To measure the case you have to put it together with specified torque but without anything in it. Keep a record of the measurements for later reference
Corrosion-Prevention.
Prior to assembly of subassemblies, all parts should be cleaned to remove all traces of preservative oil and accumulated foreign matter. During assembly, cover all steel parts with a heavy coat of preservative oil. This mixture should be used on all machined surfaces, especially on bearing surfaces, cylinder bores and piston rings. The practive of using plain lubricating oil during assembly is not recommended.

Pre-Lubrication of Parts Prior to Assembly.
Many premature failure of parts have been traced directly to improper pre-lubrication of engine assembly. If parts are not properly lubricated, or an inferior lubricant is used, many of the engine parts will become scored before the engine oil goes through its first cycle and has had a change to lubricate the engine. This, of course, will lead to premature parts failure prior to normal service life, and in some cases, lead to engine failure before normal service hours have been accumulated. It is of utmost importance, therefore, that the following recommendations be adhered to a engine assembly. Consult the latest edition of Service Instruction No. 1059.

Coat the camshaft lobes, face of tappet bodies and rocker tips with lubri-bond (A) or equivalent.
Coat the valve stems and the interior of the valve guides with Texaco Molytex "0" or equivalent.

All other parts should be coated with a mixture of 15% pre-lubricant (STP or equivalent) and 85% SAE No. 50 mineral base aviation grade lubricating oil.

Olite Bushings.
During overhaul cleaning operations it is possible to wash the oil from these bushings; also, if a bushing has been replaced and either reamed or broached, its porosity may be affected. Therefore, before the
bushings are reassembled into the engine they must be impregnated by immersing then for at least fifteen minutes in engine oil that has been heated to 140°F.

It is strongly recommended that all overhaul facilities adapt a firm policy of checking pitch alignment
of bevel gears at the same time backlash is adjusted during engine overhaul.

Oil Seals and Gaskets.
When building up an engine during major overhaul, replace all oil seals and gaskets throughout the engine. For complete replacement sets of seals and gaskets available for these engines, consult applicable parts catalog.

Arbitrary Replacement of Parts.
It is recommended that certain parts throughout the engine be replaced at normal overhaul regardless of their apparent condition. Consult the latest edition of Service Bulletin No. 240 for information on the replacing of parts at overhaul. Included among these are the following:-


All engine oil hose
All oil seals
All gaskets
All circlips, lockplates and retaining rings
Piston rings
All exhaust valves (except Inconel alloy
All exhaust valve retaining keys
Crankshaft sludge tubes (where applicable)
Cylinder fin stabilizers
All bearing inserts (main and connecting
Magneto drive cushions
Stressed bolts and fastenings
Camshaft gear attaching bolts
Connecting rod bolts and nuts
Crankshaft flange bolts
Damaged ignition cable
All laminated shims
Crankshaft counterweight bushings
Piston pin plugs
A.C. diaphragm fuel pumps