kedarp

hi,

I am not an expert but coolant is leaking from one of the steel pipe/studs that connects the rubber hose to the intake manifold of my 2005 Nissan Maxima. I don't want to replace the entire Phelgm or the intake manifold if I can just replace the steel stem which has corroded and cracked. Does anyone know what the steel connector is called or how to order one ? I have a few photographs attached since I am not sure I have described the problem with correct words. Also any tips on how to remove just that small steel stem/pipe and replace it would be highly appreciated.
Any help sincerely appreciated.

The Phelgm (intake manifold) was removed and is upside down in the photograph. The box is around the small steel pipe from where coolant enters (or maybe leaves) the manifold.

Upside down intake manifold and as seen from firewall side. The red box shows the cracked steel pipe where coolant enters (or leaves) the manifold.

Zoomed up intake manifold. The steel pipe thing that connects a rubber hose to the intake manifold has completely corroded and cracked. Want to replace just that small steel pipe in the red box.

The corroded and cracked pipe/stem where coolant enters (or maybe leaves) the intake manifold. That steel stem pile is corroded and want to replace just that one.

TDGrant

You're gonna be replacing that section of the manifold, not the coolant tube.

Check salvage yards or by new:

https://www.nissanpartsdeal.com/part...tra2=&filter=()

JSutter

iTrader: (46)

Drill, tap, thread in a new nipple.

Or buy one used if you don't have the tools, Ebay: used intake or another.

kedarp

Thanks JSutter and TDGrant. Another question: Do you know why the intake collector is even heated ?
I live in Illinois and it does get cold in Winter (around 15 degrees for a few weeks).
What do I lose if I just bypass the coolant lines for the intake manifold collector ? Is it just gas mileage or the car won't start or something else ?
I am guessing, the coolant is cold when I crank the engine so it must be about heating the air so improve mileage during winter ?

TDGrant

From Engineering Explained (https://www.youtube.com/@EngineeringExplained/videos)

kedarp

Thanks, got it.

TDGrant

Yeah, here it is in a textbook - (2020) Erjavec, J; Thompson, R. Automotive Technology: A Systems Approach, 7th ed, Cengage.

I sorta remembered it now reading about it when I was in school back in the day.


"The throttle body housing assembly is a
single-piece aluminum or plastic casting. The throt-
tle bore and throttle plates control the amount of
intake air that enters the engine. The throttle shaft
and plate(s) are controlled by the accelerator pedal,
via a linkage comprised of a cam and cable. The TP
sensor monitors the movement and position of the
plates and sends a signal to the PCM. On some sys-
tems, a small amount of coolant is routed through a
passage in the throttle body to prevent icing during
cold weather."