Author Topic: The mess under the intake  (Read 143074 times)

tjts1

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The mess under the intake
« on: May 10, 2007, 10:00:51 PM »
Phil has updated the procedure with an excellent summary of all our collective knowledge thus far. Thanks Phil! :D
Quote from: teh Phil;74524
Parts you will need:

•   Plastic Coolant Pipe from Block (Part # 11531714738) (Diagram Link)
*NOTE: Make sure this is OEM! Aftermarket pipes have been found to leak, as noted here*
•   O-Ring for Pipe (Part # 11531709157)
•   Throttle Body Gasket (Part # 13541743261) (Diagram)
•   Upper – Lower Intake Gasket (Part # 11611717761) (Diagram)
•   Lower Intake – Block Gasket (Part # 11611734684) (Diagram)
•   BMW Antifreeze (Part # 82141467704)
Or whatever brand you choose, of course.
•   5/8” Coolant Hose
•   5/16” Fuel Hose (Make sure it is fuel INJECTION hose, not fuel hose for a carb)
•   19/32” Vacuum Hose
I found all three hoses at Advance.
*NOTE: DO NOT use fuel hose for vacuum hose or vice versa. If improper lines are used they could expand or collapse.*

Under the manifold, as pictured in this thread, there is a mess of hoses.

In addition, you get rid of the throttle body heating plate, which as many have said, is of no use. Most of the hoses are unnecessary, and we’re getting rid of them as well as rerouting the vacuum lines to make future maintenance easier, and limit the number of possible leak points. Most importantly, you’re getting rid of the two junctions. You’re replacing the plastic coolant pipe because it’s relatively cheap, and they tend to crack over time on M42s. In the end you’ll have three hoses:
•   One vacuum hose from the valve cover to the intake elbow.

•   One vacuum hose from the idle control valve to the intake elbow

(the other side of the idle control valve will go to the same place, but you can extend the hose if you’d like to make the ICV easier to access.)

•   One coolant hose from the coolant pipe’s outlet to the nipple on the head. This is a personal preference; some have simply plugged the two holes. Read more here.

These two hoses are NOT the same size. Even though I trust the results found here, I'm still wary of my head cracking, so I thought I would connect the two just to be safe. A local plumbing supply store rigged this up for me, and I haven't had any leaks. It's not pretty, but it works.

I'll report back in a few months, but it seems fine. Just in case I do find a leak, I ran this just outside of the lower intake, so I can plug the lines with some bolts if necessary.
When you’re done, don’t forget to bleed the cooling system! Here’s how.

Other things to think about while you’re down there…
•   Are the two rubber coolant hoses that meet the plastic pipe we’re replacing in good shape? (#s 4 and 22 here)
•   Do you want to install a catch can? It’s really not necessary if you use synthetic oil, but some have put one in line between the valve cover and the throttle body.
•   Is it time to upgrade your injectors? Many have upgraded to Ford’s 4 pistil injectors (as opposed to our 1 jet) for better atomization of fuel. Read more here.
•   If you don’t want to change out your injectors, at least give them a clean! Pelican Parts explains how.
•   The rubber hoses going into the hard lines on the lower intake. You have to buy some short pieces that lead from the hard lines to the fuel rail, so you might as well do a little preventative maintenance and buy a few feet. (#s 15 and 16 here)
•   Clean out your AFM sensor!

For those still interested this was the original post that got this whole thing started.

This is a continuation of my renovation thread for my 318i
http://www.m42club.com/forums/showthread.php?t=2676
At this point I'm in the process of eliminating the Medusa of hoses under the intake.

Here it is in all its ugly glory.


138k miles and 17 years.


Lets count the leaks.






Virtually every hose is split at both ends.


None of this stuff is going back into the car.


I'm sure this is a familiar sight to many of you.


This is the #1 port after cleaning out about 1/4" thick layer of sludge all around the port.


For contrast: 2 clean ports in the foreground and 2 dirty in the background. The picture doesn't do it justice. That stuff is nasty, thick sticky and smelly. I will add a catch can to the new vent hose in order to separate the oil oil before it hits the intake.


Freshy fresh parts from FCPgroton and Pelican. The first one to name all the parts correctly gets a special prize.
« Last Edit: October 11, 2010, 03:25:14 AM by tjts1 »
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john318isau

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The mess under the intake
« Reply #1 on: May 10, 2007, 10:08:35 PM »
Control arm x 2, control arm bushes x 2, radiator hose x 2, heater hose, engine mount, auxillary  belts x 2, inlet manifold gaskets x 2, throttle body gasket, cardboard box?
1998 E36 318is Coupe + DASC
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1994 E36 318is Coupe (SOLD)
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1990 E30 318is Coupe (SOLD)

tjts1

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The mess under the intake
« Reply #2 on: May 10, 2007, 10:14:11 PM »
Congratulations. You win milk and cookies. Enjoy :D
« Last Edit: May 10, 2007, 10:28:59 PM by tjts1 »
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gearheadE30

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The mess under the intake
« Reply #3 on: May 11, 2007, 06:35:21 AM »
Holy crap that's a lot of sludge! Where does all that oil come from?

I should probly take off my manifold, hasn't been done in 200k miles ;). How difficult is it do remove?

1991 318is Turbo
1989 Caprice Classic Wagon named Humphrey
1979 Suzuki GS750E

FL318is

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The mess under the intake
« Reply #4 on: May 11, 2007, 07:35:08 AM »
That is scary! :eek:

kowalski

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The mess under the intake
« Reply #5 on: May 11, 2007, 09:42:16 AM »
mine was no where near that bad. however the catch can is a good idea, thats one of the things i'm gona do when i get home.
Sale:
EBC Green stuff pads = $60 shipped front and rear set available


Send $ to: kroeker.michael @ gmail.com

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tjts1

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The mess under the intake
« Reply #6 on: May 11, 2007, 10:53:35 AM »
Quote from: gearheadE30;25448
Holy crap that's a lot of sludge! Where does all that oil come from?

I should probly take off my manifold, hasn't been done in 200k miles ;). How difficult is it do remove?

Its sort of a frustrating process because you don't have access to the hoses holdind the TB plates and fuel lines for example. But if you are willing to cut hoses with reckless abandon, you should have it all out in about 1 hours. This includes time to ponder "WTF is that?"
« Last Edit: May 11, 2007, 10:58:46 AM by tjts1 »
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chris325ix

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The mess under the intake
« Reply #7 on: May 11, 2007, 12:23:43 PM »
I know it's crazy but I can't wait to get a 318is so I can take apart the upper portion of the motor and replace all the worn out stuff like that... lol!

Alpine003

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The mess under the intake
« Reply #8 on: May 11, 2007, 12:38:45 PM »
That kind of sludge is normal if you use regular dino oil, use poor fuel, drive the car hard all the time, have vacuum issues, and high mileage in general.

tjts1

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The mess under the intake
« Reply #9 on: May 12, 2007, 02:22:02 PM »
Now that all the hoses are out, you can see where the long coolant run begins on the side of the head between cyl 2 and 3, and ends at the coolant return pipe on the side of the block.


The coolant bypass is made out of a 1 foot long piece of 5/8" heater hose.


And finally the lower intake reinstalled.
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christophbmw

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The mess under the intake
« Reply #10 on: May 12, 2007, 02:36:42 PM »
replace that plastic coolant junction piece now while you can! they are really chea from the dealer.....and dont forget the o-ring that goes with it.;)
[SIGPIC][/SIGPIC]

tjts1

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The mess under the intake
« Reply #11 on: May 12, 2007, 02:42:08 PM »
Hmmm, does that part fail often? It looked solid to me but who knows. I already have lower intake in so I think i'll keep it for a while. Thanks for the tip.

The whole cooling system on this car is insane. I've counted at least 20 hoses on the side of the engine. WTF were these people thinking? A normal cooling system needs 4 hoses. 2 for the radiator and 2 for the heater. Thats it. I guess K.I.S.S. (keep it simple stupid) doesn't translate well into German.
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oldtimer

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The mess under the intake
« Reply #12 on: May 12, 2007, 09:33:50 PM »
You are lucky that you got all the parts you need to replace some aging parts.  When I got my 1991 318is I noticed the same things so I ordered them through Pelican, one out o seven tubes was correct and wrong intake manifold gasket.  Had to rely on the dealer to finish the job.  Going to the dealer I had two legs it was hard to drive the Boxster S with one leg.  Parts at the delear were on the high side.

I am sure most of you knows this.  But to clean something like that, use "white Gas".  The same gas used on camping stove and lamps.  I take photos of my engine bay to show result from doing the same thing you are doing.

Ben

kowalski

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The mess under the intake
« Reply #13 on: May 13, 2007, 08:47:21 AM »
post up some pics. i want to see how clean this stuff gets things.
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romkasponka

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E30 318is M42
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