Model Year 1983 Trivia
10-28-2002, 01:40 AM
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Model Year 1983 Trivia
As you are aware, Porsche made constant upgrades to all of their cars through the years, often in mid-production year.
There was a question about when the square tooth style of cam belt changed to the rounded tooth. I thought it was mid-1983 or MY 1984. I took a look at the 1983 Service Information manual (different than Workshop Manuals) and found that it was listed as a change for model year 1984. I thought I'd provide a few of the other major improvements for the 928 MY 83
- 4.7 liter engine, all US/Canada models were "S" model.
- rounded tooth cam belt (carry over from 944)* Note 1
- improved hydraulic dampening of the cam belt
- Improved Air Conditioning air disribution
- Improved windshield wipers
- Steering wheel and instument pod available in different colors
- hydraulic motor mounts (previous were solid with external dampener), new style mounts can be retrofitted to older models.
- starter motor NOT mounted in bell housing, uses a metal frame directly attached to the engine block (said to make the starter quieter), clutch slave cylinder was changed.
- oil pump drive gear changed from sinthered alloy to light alloy.
- intake system of oil pump: doesn’t have threaded in filter screen and plastic insert with rubber funnel. This was done to prevent intake of foreign particles.
- Cylinder head gaskets were changed June 15, 1982 (prior to MY ’83 change over). The new gasket has 4 edge reinforcements and uninterrupted silicone bead.
- change of head stud types (a special Technical Information Bulletin was published to announce the introduction date and engine numbers for the new studs)
- fuel feed and return lines shape and radius in the area of head were changed to provide greater distance to the spark plug cap of cylinder
number 3.
- Fuel line return to gas tank is cooled by air conditioning to reduce fuel heating (problem in warmer climates when car isn’t moving or is driven at low speeds).
- radiator inlet pipe modified to prevent some hot water from leaving the radiator in an uncooled condition.
- USA & Canada: 4 speed Automatic Transmission introduced.
- USA & Canada: higher gear ratios for better fuel economy.
- purging of carbon canister is regulated by load condition
- electrically heated O2 sensor to guarantee functionality even at idle speed and after long driving with throttle shut-off (a heated O2 sensor can be retrofitted to older models, route the heating wire to terminal number 15 on the fuel pump relay.
- Up-shift indicator lamp (US Manual trans. only)
Note 1: My 1983 928 was upgraded to the new style cam belt in 1996 by the PO. My build date was Nov. 1982 (early 1983 model). So, even if your car is a 1983 model, it may NOT have the newer style belt. Be sure to check when changing, DON'T just go by what part is listed for the year.
There was a question about when the square tooth style of cam belt changed to the rounded tooth. I thought it was mid-1983 or MY 1984. I took a look at the 1983 Service Information manual (different than Workshop Manuals) and found that it was listed as a change for model year 1984. I thought I'd provide a few of the other major improvements for the 928 MY 83
- 4.7 liter engine, all US/Canada models were "S" model.
- rounded tooth cam belt (carry over from 944)* Note 1
- improved hydraulic dampening of the cam belt
- Improved Air Conditioning air disribution
- Improved windshield wipers
- Steering wheel and instument pod available in different colors
- hydraulic motor mounts (previous were solid with external dampener), new style mounts can be retrofitted to older models.
- starter motor NOT mounted in bell housing, uses a metal frame directly attached to the engine block (said to make the starter quieter), clutch slave cylinder was changed.
- oil pump drive gear changed from sinthered alloy to light alloy.
- intake system of oil pump: doesn’t have threaded in filter screen and plastic insert with rubber funnel. This was done to prevent intake of foreign particles.
- Cylinder head gaskets were changed June 15, 1982 (prior to MY ’83 change over). The new gasket has 4 edge reinforcements and uninterrupted silicone bead.
- change of head stud types (a special Technical Information Bulletin was published to announce the introduction date and engine numbers for the new studs)
- fuel feed and return lines shape and radius in the area of head were changed to provide greater distance to the spark plug cap of cylinder
number 3.
- Fuel line return to gas tank is cooled by air conditioning to reduce fuel heating (problem in warmer climates when car isn’t moving or is driven at low speeds).
- radiator inlet pipe modified to prevent some hot water from leaving the radiator in an uncooled condition.
- USA & Canada: 4 speed Automatic Transmission introduced.
- USA & Canada: higher gear ratios for better fuel economy.
- purging of carbon canister is regulated by load condition
- electrically heated O2 sensor to guarantee functionality even at idle speed and after long driving with throttle shut-off (a heated O2 sensor can be retrofitted to older models, route the heating wire to terminal number 15 on the fuel pump relay.
- Up-shift indicator lamp (US Manual trans. only)
Note 1: My 1983 928 was upgraded to the new style cam belt in 1996 by the PO. My build date was Nov. 1982 (early 1983 model). So, even if your car is a 1983 model, it may NOT have the newer style belt. Be sure to check when changing, DON'T just go by what part is listed for the year.
10-28-2002, 05:31 AM
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My 83 Euro S, delivered 10Jan83, had a round tooth belt when I did it last year, and at 41k miles indicated, I dont think it had been done before. I think this change came early in the 83 MY, but I may be wrong?
jp
jp
