Cylinder Bores - Procedure For Deglazing
83jaguar01SEPTEMBER, 1983
ITEM: J83/45
SUBJECT: DEGLAZING CYLINDER BORES
MODEL: ALL
Should it be necessary to deglaze cylinder bores due to excessive oil consumption, the following procedure must be observed. This is the only deglazing method approved by Jaguar Service:
EQUIPMENT
(a) GBD 89 mm (3.5 in) diameter 80 grit silicon carbide flex hone tool. The Flex Hone Tool is color coded orange at the hone end of the tool.
(b) Variable speed electric drill, which must be capable of running at 750 rpm unladen.
METHOD
1. Remove engine and dismantle as per Repair Operation 12.41.05.
NOTE: It is NOT necessary to dismantle the cylinder head.
2. Position the dismantled cylinder block so that the Flex Hone Tool can be inserted vertically.
Tape over water and oil galleries on cylinder block top face.
3. Lubricate each cylinder using clean engine oil.
4. Secure the Flex Hone Tool in drill.
5. The Flex Hone Tool must be revolving when inserted OR removed from each cylinder, and must not be stopped and restarted during the deglazing cycle.
Using a vertical stroking motion (with flex hone already revolving), hone for 45 seconds at the rate of 2 strokes per second.
THE DURATION OF HONING TIME AND THE NUMBER OF STROKES PER SECOND MUST BE STRICTLY OBSERVED TO GIVE THE CORRECT BORE FINISH AND CROSS-HATCH SPECIFICATION.
This method has been developed and evaluated on Service cylinder blocks, and when strictly adhered to, will produce the required bore finish.
CLEANING
(a) Remove oil gallery plugs and flush out oilways with suitable cleaning solvent. Replace plugs.
(b) Using soapy water, thoroughly brush cylinder bores AND crankcase.
(c) Brush the bores and-crankcase with clean water.
(d) Wipe each bore with clean white cloth/tissue. Wipe all main bearing journals similarly.
Repeat process until cloth/tissue can be removed clean.
CLEANLINESS CANNOT BE OVERSTRESSED.
IMPORTANT - Even though oil consumption is diagnosed, IT MAY NOT BE NECESSARY to deglaze cylinder bores.
FIGURE 1:
If there is no measurable bore wear and the cylinder walls have a surface finish as indicated in Fig. 1, it will only be necessary to replace pistons and/or piston rings.
Claims should be submitted quoting 1B1X in the comment box.
The following Repair Operation is applicable:-
12.41.24 Deglaze Cylinders 19.40 hrs.
The Flex Hone Tool is available from:
Brush Research Manufacturing Co. 4642 E. Floral Drive Los Angeles, California 90022
(Telex: 67-7368 BRUSHCO LSA)