manifold problem

[docc]

24 minutes ago, p6x said:

I used petroleum jelly on rubber parts. The one that can serve as a replacement to Vaseline. Same result and very cheap.

The key difference is the "temporary" emphasis.

Yes, common lubricants can help get rubber parts assembled, but may also facilitate their coming back apart because they are not "temporary."

In that regard isopropyl ("rubbing") alcohol can be a solution as it is "slippery when wet", but evaporates quickly.

The P-80 is the engineered solution.

[gstallons]

Just do what you think is best.  I was going from memory when I repalced the fuel injectors.

[igor]

thanks everyone for your advices , after contacting a moto guzzi mechanic in belgium , they said that apparently you can put the new rubber without taking the body throttle out , ordered the pieces at TLM in Holland . 

Will keep you updated of the process . 

igor

[Pressureangle]

I found that it's much easier to install the rubbers onto the engine side first, as it's stable. Then the throttle bodies into the stable rubbers.
 

[p6x]

13 hours ago, docc said:

The key difference is the "temporary" emphasis.

Yes, common lubricants can help get rubber parts assembled, but may also facilitate their coming back apart because they are not "temporary."

In that regard isopropyl ("rubbing") alcohol can be a solution as it is "slippery when wet", but evaporates quickly.

The P-80 is the engineered solution.

I was only looking at an easement of the task. 

As with any of the supplies we buy, we use them once, punctually, and then they expire, because the shelf life is short.

I noticed, that due to the temperatures in Texas, some of my supplies don't last more than one usage.

[Lucky Phil]

As I've mentioned before the easiest way to fit throttle bodies and TB rubbers is to remove the inlet manifold from the head. The reason? because the TB's are set at an angle to the cylinders and the "natural" neutral tension position is only achieved when they are the correct distance front to rear from the heads. You can wrestle and grunt them around to flex the rubbers and make then fit but it's hard on the throttle bodies and their mounts. Far, far easier to simply remove the aluminium manifold straight push the manifold onto the rubbers and move the aluminium manifold forward again to align with the head surface and bolt it up. No stress no pushing and pulling.

Phil     

[audiomick]

7 hours ago, Pressureangle said:

I found that it's much easier to install the rubbers onto the engine side first, as it's stable. Then the throttle bodies into the stable rubbers.
 

That's the only logical way to go at it, I reckon.

The rubbers from the airbox to the throttle bodies retract into the airbox out of the way, so it makes sense to me to start at the engine end, put those rubbers on, put the throttle bodies on, and then put on the ones to the airbox.

Much easier than it was on my GTR 1000 Kawasaki. Both the rubbers to the engine and the rubbers from the airbox were fixed in place. Getting the carburettor bank in required something akin to a set of tyre levers, much patience and brute force, and a plethora of cursing.

 

Incidentally, someone mentioned further up replacing both the rubbers between the throttle bodies and the intake manifolds and the rubbers between the airbox and the throttle bodies. Good plan, but it is worth noting, I think, that the ones between the throttle bodies and the intake manifold are more critical.

They are downstream of the injectors, and if there is an air leak there it will definitely affect engine performance. The ones from the airbox to the throttle bodies are upstream of the injectors, so a leak there will allow "dirty air" into the system, but should not affect the mixture and thereby engine performance.

Edited June 3 by audiomick

[Admin Jaap]

On 6/2/2025 at 5:00 PM, p6x said:

See? this one is from Stein Dinse in Germany.

They have become rather expensive! I remember being surprised by how cheap this part was (back in the day 🤪)

[GuzziMoto]

I would agree with Phil. Can you install the new rubber manifold boots without removing other parts? Sure. But it is going to be hard, mainly because of the awkward angle of how the throttlebodies attach to the heads. Sometimes it is easier to take something further apart to put it back together. But to each their own. I would put in a little extra work to take things further apart to make putting everything back together easier.