TM 5-3805-260-24BASIC BLOCKWhen honing cylinder blocks, maintain thespecific dimensional surface finish and cross hatchtolerances to obtain safisfactory oil control. Thetolerances specified are virtually the same as those usedfor original bore finish at the factory, and can be obtainedwith an automatic honing machine such as the SunnenCK-I0. This machine has been evaluated and found togive satisfactory results.Due to the cost of suitable honing equipment, itmay be more expedient to have the honing done by ashop equipped with a Sunnen CK-!O or equivalent.TRANSIT PREPARATIONThe following Steps can prevent damage to theblock in transit to a shop.1.Completely disassemble, but do not clean block.The residual oil on the surface will prevent rust.2.Enclose the block in an industrial plastic bag andposition it with the oil pan surface on a suitablewood pallet or equivalent. Dimension of asuitable wood pallet are shown.TRANSPORTING PALLET3.Cover the block with 1/2 in. (12.7 mm) thickplywood or equivalent, and band block to thepallet.4.Follow similar instructions when block isreturned. To prevent rust, the block shouldnot be cleaned after honing, the film ofhoning oil provides ample protection fromrusting.NOTE: If blocks are to be stored for any length of time,clean and anti-rust after honing.CLEANING PROCEDUREAfter honing is completed, and beforeassembling the engine, the cylinder block must becleaned and prepared according to the followinginstructions.1.If not previously removed, the camshaft bearingsmust be removed to permit thorough cleaning ofthe oil passages. To remove the bearings, seethe topic CAMSHAFT BEARINGS REMOVALAND INSTALLATION.2.Use 1P3565 Chamfering Group, remove thesharp corner at the bottom of the cylinder boresas shown. This is essential to prevent scuffingthe piston skirts. The chamfer should beapproximately 10° x .09 in. (10° x 2.3 mm).CHAMFERING BORECAUTIONAvoid damage to the cylinder bore surface or anyother parts.3.Using the 1P5580 Brush Group and a strongdetergent and water solution, clean the followingareas of the block.A.Main oil gallery and supply passage. Usethe IP5572 or IP5573 Brush and strokeseveral times while rotating the brush.B.Camshaft bearing oil passages. Use the1P5571 Brush and stroke several timeswhile rotating the brush.C.Cylinder bores. Use the 1P5574 Brush andstroke each bore for one minute whilerotating the brush at 1000 rpm.3-368
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business