Engine - Replacement Assembly Availability
Bulletin No. T 85-95AFile in Group 6A
Number 74
Corp. Ref. No. 805 4266-2
Date Dec. '85
SUBJECT: HT4100 SERVICE ENGINE ASSEMBLIES
MODELS AFFECTED: 1982-1986 ELDORADOS, SEVILLES, DE VILLES, BROUGHAMS AND FLEETWOODS
This bulletin supersedes Serviceman Bulletin T85-95, Group 6A, which should be destroyed.
The HT4100 service engine assemblies listed below are now available through GMWDD, and supersede all previously available partial engine assemblies. These hot tested engines incorporate all refinements of current model production.
MODEL SERVICE ENGINE P/N
1982 Eldorados and Sevilles 3634645
1983-1984 Eldorados and Sevilles 3634643
1985 Eldorados and Sevilles (Except California) 3634643
1984-1985 All Eldorado Convertibles 3634643
1985 Eldorados and Sevilles (All California Exc. Convertibles 3634647
1982 RWD De Villes and Broughams 3634644
1983-1984 RWD De Villes and Broughams 3634642
1985 RWD Broughams (Except California) 3634642
1985 RWD Broughams (California) 3634646
1985-And Before Number 1986 FWD De Villes and Fleetwoods** 3634655
1986-After Number, FWD De Villes and Fleetwoods** 3634657
1986 Eldorados and Sevilles 3634656
** Before number engines are equipped with an aluminum oil fitter adapter, the after number engines are equipped with a magnesium adapter which is black in color.
Service engine assemblies include: cylinder block assembly, connecting rods, piston and liner assemblies, crankshaft, crankshaft balancer, flywheel, camshaft and lifters, cylinder head assemblies including valve trains, camshaft and crankshaft sprockets with chain, front cover, water pump, oil pump, oil pan, intake manifold, oil filter, and instruction sheet.
When installing these service engine assemblies:
1. The following components must be transferred to the replacement service engine:
vehicle identification plate, exhaust manifolds, throttle body, distributor with thrust washer, EGR valve, generator, power steering pump, vacuum pump, AIR pump, A/C compressor, and all brackets, pulleys and belts.
2. Before installation of the distributor, the distributor thrust washer must be transferred from the original engine to the service engine and a new distributor gear must be installed. Also, the new distributor gear must be lubricated with prelube P/N 1052365.
3. The following items must be ordered separately as listed:
1982-1984 Eldorado and Seville
1052365 Distributor Gear Prelube
1979546 Distributor Gear
412485 EGR Valve Gasket
1624583 Throttle Body Gasket
1630830 Crankcase Breather Hose
1626761 PCV Hose
6487779 PCV Valve
1629941 Throttle Cable Bracket
*489106 Cap-Vacuum Tee
1631153 Vacuum Pump Bracket
2044779 Clip - Evaporator Pipe Attachment
22527475 Screw - Evaporator Pipe Attachment
* 1982 Only
1982-1984 RWD De Villes and Broughams
1052365 Distributor Gear Prelube
1979546 Distributor Gear
412485 EGR Valve Gasket
1624583 Throttle Body Gasket
1630830 Crankcase Breather Hose
1626761 PCV Hose
6487779 PCV Valve
1629940 Throttle Cable Bracket
*489106 Cap-Vacuum Tee
* 1982 Only
1985 FWD De Villes and Fleetwoods Originally Equipped With Stamped Metal Valve Covers
1052365 Distributor Gear Prelube
1979546 Distributor Gear
412485 EGR Valve Gasket
1620870 Gasket - EFE Grid
1630831 Crankcase Breather Hose
9438373 PCV Hose
6487532 PCV Valve
1628916 Vacuum Pump Outlet Pipe
1631225 Power Steering Pump Bracket
1985-1986 All Models Originally Equipped With Cast Valve Covers
1052365 Distributor Gear Prelube
1979546 Distributor Gear
412485 EGR Valve Gasket
*1624583 Throttle Body Gasket
**1620870 EFE Grid Gasket
*Longitudinal Engines **Transverse Engines
For warranty purposes, use labor Operation No. J 1880 at 7.7 hours "E/K", 8.4 hours RWD "C/D", and 7.4 hours FWD-C.