560 Intake Manifold
 

I may (and I stress MAY since I don't know for sure yet) need to replace my intake manifold on my 560SEL. Could anyone point me in the right direction towards finding this part. None of my local junkyards have a 560 to pull this off of so...

Also, what would be a reasonable price for the part?


Thanks!


Scott

I don't know where you are at, but if you are around Sacramento, I know a guy who has 2 junked 560 engines laying around. If you are interested, let me know and I will hook you up.

I should know more early next week. I appreciate the reply and I'll let you know. Mine may be okay, but apparantly there is a vacuum leak between the head and the manifold so I'm cautiously optomistic that I didn't warp my IM when I did my valve job and I just have a bad gasket. I appreciate the reply, and will let you know as I know more! Thanks again!


Scott
Littleton CO,

Why do you think you need to replace your intake manifold? It's made up of two aluminum castings joined by rubber tubes.

Fill us in please.

Pulled the heads and had to replace 4 bent valves and all valve guides.
When rebuilding the top half upper manifold wasn't seating properly due to moment applied by EGR pipe. Hand threaded most of the bolts and the manifold seated. Two of the bold did not want to turn freely, but by this time, I had about half of the bolts snug, but not torqued... (done by hand with a socket extension and the hex drive, no wrench) The rearward bolts were still hesitant, so I removed all of the bolts disconnected the evil EGR pipe from the EGR valve and reseated the manifold. For good measure I went to the second set of intake gaskets I had (included with head gasket kits). Manifold seated much better this time and all bolts went though just fine with no hesitation. Reconnected evil EGR pipe to EGR valve after manifold was torqued down. Finished rebuild. Car runs rough and sputters out at idle. Now there is apparantly a leak in the intake manifold somewhere which is affecting the vacuum since the car will not hold an idle or blow proper emmissions. The cause is now being troubleshot by a mechanic here in Denver. Car was taken to mechanic for final vacuum checkout since I lost my pictures from disassembly and could not find helpful schematics on my 126 CD. After straightening out my vacuum-line-spagetti, the mechanic told me there appears to be a leak on the rear of my intake manifold, probably a sealing issue, as determined by spraying ether (or other flamible arisol) and noting rev changes. Mechanic gave me worse-case senerio of what he thought it might be. I can't imagine that I damaged the manifold during the first attempt at attaching it, however I'm not dismissing the possibility that it was damaged in another way while it was off the car for 3 months (was only able to work on it for about 1 day each weekend). My guess is that probably either those doughnut gaskets between the upper and lower manifolds didn't seal peoperly or that the moment applied by the EGR pipe is causing an issue with the manifold/head interface(s). I doubt the problem is a bad manifold, but I can't rule it out thus I'm planning for the worse and should probably know more by tuesday. I hated having to take the car to a mechanic, but at least I was able to drive the car to the shop!

Thats the manifold story in a nutshell

Thanks for the information on your problem. The best advice is to replace the rubber connector tubes between the manifold halves. There are additional rubber pieces that need to be resealed.

The site, http://www.pindelski.com/ , which is a subscription site at $30/yr, is a great resource and also has a section on R&R of the V-8 intake manifold.

Oh, and to add, I had replaced all gaskets during the rebuild.

I'll remember that site, I'm sure I'll have another project sooner rather than later!


Thanks!


Scott

The vacuum hose that connects to the transmission vacuum modulator could have fallen off at the rear of intake manifold.

I lost the bolt for that hose and it was something I notified the mechanic of. It had been reconnected and checked before the interim diagnosis was made.

Intake system leaks
 

There are MANY possible leak points on this baby. Personally, I use Hylomar on all gasket surfaces to ensure airtight seals.

Do not forget the seals around the fuel injectors and all the rubber hoses associated with the throttle body system. Even a small leak in any one will throw off the idle. A crack in the air flow sensor bottom half (rubber) will also act like this.

Thomas Pindelski has 164 pics with explanations on overhauling the intake manifold. I reviewed it today. I have an M103 so most of the explanation does not apply to my car but the principlals are the same.