Thread: Exhaust manifold.

Originally Posted by Kimsl70

G’day all.
I’ve got a broken bolt in my exhaust manifold. I’m working on a plan to get it out. But the reason behind the post is that it I’m not sure about the manifold. It seems to have the heat box as a part of the manifold and everything else has it seperate. Photos attached will do a better job of explaining than my ham fisted attempt. Is this normal ? Also attached is a progress pic. .


Cheers.

You may find it is a deflector flap to direct exhaust gases to the base if the inlet manifold they usually have a by- metallic spring that rotates the flap once the engine has heated up . This type of system usually seize . They are better off being seized open than closed. You can free them up by spraying with WD40 & working it back & forward a little at a time until free. None of my Parts books show that type of manifold , they may have been used in very cold areas to worm up the air fuel mix on cold start up.

Originally Posted by 1950landy

You may find it is a deflector flap to direct exhaust gases to the base if the inlet manifold they usually have a by- metallic spring that rotates the flap once the engine has heated up . This type of system usually seize . They are better off being seized open than closed. You can free them up by spraying with WD40 & working it back & forward a little at a time until free. None of my Parts books show that type of manifold , they may have been used in very cold areas to worm up the air fuel mix on cold start up.

Thank you. I really appreciate the reply. I can’t seem to find the manifold in any of my parts books either.

I found this when I was fiddling to day DSCN4337.jpg Sorry not very clear . I looked up Land Rover 2.25 exhaust manifold for cold climate & found it on the UK Land Rover Forums. Looks like you can adjust the amount of heat deflected to the bottom of the inlet manifold. The vehicle may have been used on the S.M.S
The vehicles I remember that had this type of flap were the old Holden grey motors &the flaps were always seizing .

It's an early Series two 2-1/4 l manifold with "swan neck "exhaust.
.W.

Series 2 and very early 2a had the 'swan neck' manifold, replaced by the one with the straight down outlet some time during early 2A production. The swan neck and the early straight down ones seem to have had the thermostatically controlled flap on the hot spot, but later ones did not. The flap invariably either seizes or wears the shaft and rattles and leaks exhaust. The reason for it is to provide a controlled hotspot to ensure protection against carburettor icing when the engine is cold. In our climate it does not seem to make any practical difference.

Originally Posted by 1950landy

I found this when I was fiddling to day DSCN4337.jpg Sorry not very clear . I looked up Land Rover 2.25 exhaust manifold for cold climate & found it on the UK Land Rover Forums. Looks like you can adjust the amount of heat deflected to the bottom of the inlet manifold. The vehicle may have been used on the S.M.S
The vehicles I remember that had this type of flap were the old Holden grey motors &the flaps were always seizing .

Thank you, I appreciate the help.

Originally Posted by B.S.F.

It's an early Series two 2-1/4 l manifold with "swan neck "exhaust.
.W.

G’day. Thank you for the reply and the info. Any chance you’d be able to tell the size of the fixings ? Number 47 on the illustration ? Thank you.

According to my parts book the nut is a 5/16" UNF my guess is booth ends of the stud are the same thread but the end screwing into the manifold may be UNC , but UNC is usually only used when screwing into alloy . It dose not give a length for the stud. It shows in my book they are the same P/N as the later manifold.