I see alot of links that say series 4 motor, or series 5 motor, how do you know which one you have, and whats the difference? Oh if you cant tell, Im new, had my 7 for 2 days. And I f*ckin love the beautiful piece of metal.

 

well 87-88 series 4. 89+ series 5. as far as differences on the outside its pretty hard to tell. i dont think the series 5 have the rod that comes from the metering oil pump....cant think of anymore at the moment

 

Series 5 will have the VDI intake system...series 4 will not. Series 4 has a big metal boxy thing on top (Dynamic Chamber), that has ridges going front to back.. It will say "13B Injection" i think on it.. Series 5 looks different, but I can't remember how.

Also..hm...something makes me want to say the throttle body is reversed between the two... but that may just be the turbo/na difference.

-Tesla

 

Rad cap of series 4 is on the engine (water pump?) which the series 5 is on the rad.

 

It's right before the thermostat on a Series 4. Up close to the engine.

 

What series is the '86 base?

 

All 86-88 is series 4, All 89-92 is series 5.

On BOTH of my series 4's, I have *TWO* rad caps.. One on the radiator, and one right next to the thermostat..

Of course, nothing says it's the stock radiator..

-Tesla

 

The one on the radiator is the radiator cap, the one next to the thermostat is the FILLER cap.

Here's a link with Series 4/5 TII differences:
http://www.hitman.hm/13BHints.htm