Chimaera throttle heater pipes

[Limpet]

Hi all,

Currently putting my '96 Chimaera 400 (late mk1, serp) back together after a manifold change escalated when both manifold to head bolts on no 7 snapped when I attempted to remove them. The only way to get them out was to pull the head off to be able to weld nuts onto the remnants and remove them. Managed to do this OK without any thread damage, but it was painful..

Anyhow, that's all sorted now, the head is back on and torqued down with new gasket and stretch bolts, the replacement manifolds in, bolted up and connected to the Y piece, and everything is going swimmingly. Mostly. Unfortunately, this has been done around work and other commitments, so we are talking a couple of months since I first took it all apart. I took lots of photos, and it's all pretty logical anyway, but my photos (and memory) are letting me down in one area.

It appears that my car has had the throttle heater disconnected given that no hoses were connected to the two stubs under the air bypass hose on the throttle body. No issue with this at all. I can see one of the hose connections that would have originally fed this near no 1 injector on the inlet manifold. I also have a short length of hose left over, which presumably connects to this, and to the other hose connection to bypass it. As I had the head off, everything connecting to the plenum or inlet manifold had to come off.

My question is, where in the name of all that is holy is that other hose connection? I have had a good nose with the torch, and I can find nothing.

Many thanks in advance.
Limpet

[Belle427]

1 hose should have a bolt in as per this picture, can't answer the question about the second hose though sorry.

[sixor8]

It's not just your car, OP, the throttle heater pipes are not used on any Chimaera or Griff. The photo above is what I've encountered on 3 x Chimaera and a Griff, some people make use of it as a bleed point for the coolant system,

[Limpet]

Thanks both, much appreciated

That’s definitely the same connection that I was talking about, and that hose looks very similar to the one that I have “left over”. The problem is I don’t recall there being a bolt or any sort of bung in the end of it. Have photos of the engine bay before I started, but because of all the plumbing in the way, the inlet manifold isn’t particularly visible.

My concern was that it was connected to something the other end, and I’d have a massive coolant leak when I filled it up, but what you say makes perfect sense. Despite searching, there appears to be nowhere to connect the other end of this hose to.

I’m thinking now that I will just fit the hose as per the pictures (with a bolt secured in the end) and proceed as planned. I guess I’ll know for sure once I try to fill the system up.

Thank you both, sincerely appreciated.

[Belle427]

Fill with a litre or two of water first just in case you see a leak

[Limpet]

Belle427 said:

Fill with a litre or two of water first just in case you see a leak

Good shout thanks, will do.

[Limpet]

Connected the hose to the stub and put a bolt in the end secured with a jubilee clip. Refilled and bled the system, and no leaks. Happy days.

Thanks everyone.

[Belle427]

Would be a good idea to put some sort of valve or tap on the end of it for bleeding purposes.
I think that's what it was designed for, but a good old M8 bolt worked for Tvr!

[Sardonicus]

My bleed port is on the other side of the inlet manifold Renault use these nice little thumb screw bleed ports , have used them on many engines over the years the pipe pic above from Belle427 is tapped and capped (no ugly hose flopping around )

Edited by Sardonicus on Monday 17th July 13:44