Confused About 911sc Engine Pic's

[robert walsh]

I have an '83 3.0, i think it is the original motor but not sure, all the pic's i seem to see of of the bottom of the motor shows a round (6" dia.) plate secured with several small bolts with the oil drain plug in the middle, mine does not have that plate at all, the case is just bolted together with the drain plug on the side of the case, (with #930.101 104 5R). i dont know where to find the engine id # thats all i find, Is mine typical of an '83 3.0 or are the other pictures typical?? Everthing up top looks the same as the others, the cis etc.

[poorsha]

I would like to see a pic of that.

[javadog]

During the 1983 model run, Porsche changed the crankcase design. Supposedly cars built from April 1983-on had the new crankcase. I imagine there was a service bulletin on this but my copies are stored at a warehouse, so it's not handy to go look it up.

JR

[robert walsh]

would like to post pic's but can't at this time, the #930.101 104 5R is stamped on the lower case, i am sure of what i have, if in fact they did change in 4/83 my mfg date is 5/83 does this make it a better case?

[83-911SC cab]

Robert,

My 83 SC Cab has the engine case like yours with no round cover. Mine is just the two case halves bolted together with a drain plug on the drivers side. Unfortunately my Cert of Auth does not have a Date of birth for my car on it.....

Gregg

[TibetanT]

Javadog is correct! Different case used later.

I have an early production model 1983 and it has the sump plate cover.
The later year production models tend to look more like the Carrera's case starting with the 1984 model years.

The case was changed with later model 1983 VIN numbers after summer (in U.S. showrooms) if not mistaken.

[robert walsh]

I thank your for the clarification about the new case mfg after 4/83, any idea if during that change they may have addressed the stud problem issue at the same time? I have not experienced and problem so far with the studs and i did do the tesioner update, just hoping maybe they corrected that at the time they changed the case. It is unusual that i never heard of the updated case until now, thanks for the info.

[SCWDP911]

Huh... I have the later style as well. Never realized it...

[ZAMIRZ]

My ROW car is manufactured April of '83 and has the sump plate.

Maybe this April '83 info only applies to USA cars.

[tcar]

Engine mfg. date does not coordinate exactly w/ chassis mfg date.

[aigel]

Very common to see 83 SCs with the later case style (as seen on the Carrera).

No, this does not mean your head studs have changed. Those stayed the same into the Carrera years.

Bruce Anderson tells the story that Porsche was looking ahead, preparing for some possible Euro laws that would not allow draining oil out the bottom. Engines would be built without a drain plug and only sucked out from the top. This would keep shade tree mechanics from draining oil into the sewer. All you would have to do on that case of yours is not drill and tap the drain hole. Seemed like an odd story to me ... you got a drain plug after all - phew!

George

[robert walsh]

It makes no sense to me that porsche would change the case design for less than 1/2 year run to satisy a possible "GREEN ISSUE" regarding oil in the sewers from backyard mechanics. Is it the same case as the next gen 3.2, this would make more sense. When spending all thes dollars or euro's why would the not have addressed the somewhat common problems of the 3.0 as they did when the 3.2 came out, cam tensioners, studs etc. Makes me wonder how they think at times. I know first hand that the case design was in fact changed, just don't understand why.

[javadog]

I guess they figured out that the strainer really wasn't needed. In addition, many owners damaged their oil pump pipes by installing the strainer incorrectly. As for the timing, the story goes that the molds for the old crancase were wearing out and it didn't make sense to make new ones of the old style, for just a few months production, as they had planned to introduce the new crankcase in September '83 production.

JR

[aigel]

The environmental law anticipated was not the reason to change the case on the SC. They came up with a new case design anyway. The SC just already got it. The late SC case is the same than the Carrera case.

When asking these questions you have to remember that Porsche was a very small factory back then. In addition, the 911 was not something they really were inclined to continue to produce. So it was at times a bit of a patch job and it took all the way to the 964 until they went back to the drawing board and redesigned much of the car from scratch...

George

[javadog]

I looked up the bulletin and it stated that they started using the new cases in production in March of '83. The reason for the change was given, they intended to strengthen the case. A new oil pump with a filter screen on the end of the pickup tube was included.

JR

[Peter Zimmermann]

Originally Posted by robert walsh

I thank your for the clarification about the new case mfg after 4/83, any idea if during that change they may have addressed the stud problem issue at the same time? I have not experienced and problem so far with the studs and i did do the tesioner update, just hoping maybe they corrected that at the time they changed the case. It is unusual that i never heard of the updated case until now, thanks for the info.

1983 911sc stud question

Post #9...

[robert walsh]

With all this being said, is there an advantage to the newer style case, be it from a mechanical or perhaps collectible aspect?

[Peter Zimmermann]

Originally Posted by robert walsh

With all this being said, is there an advantage to the newer style case, be it from a mechanical or perhaps collectible aspect?

Nope, just makes it easier to change the oil!

[javadog]

Originally Posted by robert walsh

With all this being said, is there an advantage to the newer style case, be it from a mechanical or perhaps collectible aspect?

It's stronger, if that matters. Collectible, no.

JR

[robert walsh]

With it geing the sronger case did they possibly improve to the better case studs that are an issue with the earlier cases?