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my car does neither have a marinelli or a bosch distributor, do you guys think i should replace it and if i should replace it should i get an marinelli or a bosch or any other better replacement alternative ?
from looking at my sparkplugs i seem to have a v4 currently.
thanks for your help and advise, my engine is a 1975 2.7l
the dark red used rotor is my current, the new britger red is the origiunal bosch replacement and its slightly too wide to fit on the distributor. the original bosch cap i had purchased also does not fit.
There are tricks. First, you should rotate the engine to align the Z1 mark so Cylinder #1 is at Top Dead Center, and the distributor rotor is pointing at the Cylinder #1 plug wire. You do this by rotating the alternator nut clockwise (you may need to pinch the belt with your fingers so the crank pulley rotates too). The marks are on the crank pulley and the bottom of the alternator housing. This should be easier if you remove the spark plugs, but I don't think you really need to. There should be a notch in the distributor housing that the rotor should point to, corresponding with plug wire #1.
This is important so when you reinstall the distributor you can make sure that it is properly aligned.
Before you spend money on a distributor you might want to confirm or deny the ignition system that is in the car. 75 (original) would have a CDS system with a Bosch distributor. Stock these use a point set with low current draw.
Terry
75 911S
I looked at your photos again and my best guess is that you have a Bosch distributor. Give away is the wire clip next to the vacuum diaphragm. What you may have is a distributor that has been modified to eliminate the points. Pertronics makes such a beast and you can see photos of the components on Pelican Parts web site.
Terry
75 911S
im in the dominican republic, whoever had the car before had no clue on what he was doing, im guessing more towards a VW passat distributor or some other crap, whoever has seen the currently muffler setup on my other post knows what im up to.
i will remove it in the next few days, but im running into a problem, there are NOOOO marks on the crank pulley and the bottom of the alternator housing !!!!!!
there is also no bosch serial or bosch logo on the visible sides.
on top of that the clips for the caps do not look like the ones from bosch distributors i have seen on ebay etc.
Bosch numbers should be something on the order of 0-231-169-003. could also be 231-189-003. variations from this are 004 & 005. These are from US spec cars.
As to no marks. Odd. Best I could think of would be to insure that the distributor rotor is on Number One and both valves are closed. I'd scribe the distributor to the case before I pulled it.
Terry
75 911S
I commented on this a few weeks ago, but if this is a 2.7L someone 'splain to me how the distributor is attached to the block via the unmovable ring that locks down the distributor via a pinch bolt.
Looks like I grabbed some micro photos off the web. First should be the 2.4/2.7 model, second is a 2.2-and-earlier (here, a Marelli, but focus on how the distributor attaches to the engine case.)
Interesting. In looking at the photos again I don't see the ridge in case casting that the stud for the hold down nut for the distributor screws onto on my 75 This might explain a few things like the older carburetors and no serial numbers where they should be on a 75. This may be a 2.2 that was put in a 75 chassis.
Terry
75 911S
A 2.2L T engine would explain the Zenith carbs, but don't forgot that he's also apparently got thermal reactors under there (photo in this thread: https://rennlist.com/forums/911-foru...questions.html). I can't imagine adding them to a 2.2L, so it is still likely a 2.7.
Maybe it's just not a 75, and they changed the hold down nut at some point? I'm not familiar with subtle 2.7L revisions over the years.
I have the factory shop supplements from 72 to 82 for the 911. According to those the distributor design was changed in 72 with the 2.4 and remained the same at least through 82. The casting ridge I'm referring to would be just below and to the right of the vacuum diaphragm shown in the photo. The ridge is pretty pronounced and comes up to the bottom of the distributor. In his photo this area appears to be covered in sheet metal.
Terry
75 911S
04-15-2017, 02:02 PM
wrong ignition distributor 1975
i will remove it in the next few days, but im running into a problem, there are NOOOO marks on the crank pulley and the bottom of the alternator housing !!!!!!
