478344 Volvo.Penta Spacer sleeve

This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4371" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
This Revised Service Letter replaces the May 13, 1998 (Revised July 1998) Service Letter. Changes have been made to the TERMINATION DATE, Affected Product, Parts Needed, Action Required, and Servive Claims Allowances.
Termination Date
December 31, 1999Problem
The intake or exhaust valve may fail on certain 3176B, 3176C and 3196 Marine Engines.
Affected Product
Model & Identification Number
3176B (9WK1-837)
3176C (6BW1-401)
3196 (2XR1-1271)
Parts Needed
3176B1 - 1517456 Gasket Kit 12 - 1570671 Valve-Exhaust12 - 1570672 Valve-InletAftercooler Gaskets2 - 3P0649 Seal2 - 4P3871 Gasket3 - 9X7287 Seal2 - 1095307 Gasket1 - 1161071 Gasket 3176C/31961 - 164-4581 Gasket Kit12 - 1570671 Valve-Exhaust12 - 1570672 Valve-InletAftercooler Gaskets1 - 9M9989 Gasket2 - 3P0649 Seal2 - 4P3871 Gasket3 - 9X7287 Seal2 - 1095307 Gasket 3176B/3176C/3196Use As Required1382005 Exhaust Insert *1382005 Exhaust Insert *Action Required
Before beginning the rework, take a picture of the area to be worked on and again when the work is complete to assure the boat has been left in the same condition after the repair was completed.
1. Remove the cylinder head following the instructions in the Service Manual. When possible place blocks of wood on top of the oil cooler to support the exhaust manifold and aftercooler assembly. Remove the bolts from the manifold so that the manifold rests on the blocks of wood. Or you can fabricate some brackets to hold the manifold in place. If the boat is not equipped with hatches or if there is adequate overhead clearance, remove the aftercooler housings core from the exhaust manifold. Remove the exhaust manifold. Typically the aftercooler needs to be removed only on the starboard engine. If the boat is equipped with hatches, then have the boat yard remove the furniture and carpeting to gain access to the hatches. On single screw boats remove the cylinder head with the aftercooler and exhaust manifold in place.
2. Remove the 1095337 Exhaust Valves from the cylinder head.3. Remove the 1230486 Intake Valves from the cylinder head.4. Visually inspect the valve seats to determine if grinding the seats is necessary. GRINDING NOT REQUIRED:
360 degree mirror like appearance
Grinding Required:
Dull, frosty or circumferential grooving will require grinding.
5. Using valve grinding equipment, dress each valve seat insert to the Specification in the Service Manual. (If Required) 6. Install the new 1510671 Exhaust Valves.7. Install the new 1510672 Intake Valves.8. Install the cylinder head on the engine.9. PROCEDURE FOR TIGHTENING HEAD BOLTS This procedure is the same as found in the Service Manual except that the recommended thread lubricate has changed to the 6V4876 Molycoat Paste from the former 4C5593 Anti-sieze.
10. Lubricate the bolt thread, under the side of the bolt head and the washer with 6V4876 Molycoat past. MUST BE done each time the head bolt is installed.11. Tighten bolt (1) through (26) in a numerical sequence, (See Illustration in Service Manual). Tighten each bolt to 160 15 N m (120 lb-ft).12. Tighten bolt (1) through (26) again in numerical sequence, (See Illustration in Service). Tighten each bolt to 160 15 N m (120 lb-ft).13. Place a mark on bolt (1) through (26). Rotate the bolt (1) through (26) in numerical sequence, (See Illustration in Service), 90 degrees ( turn)14. Tighten the bolt (27) through (33) in a numerical sequence, (See Illustration in Service). to 28 7 N.m (20 5 lb ft).15. Stamp "RZ" into the cylinder block next to the serial number plate.Service Claim Allowances
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.