GerritD

Hi Schocki, indeed super material as long as you don’t use it where forces are put on both repaired/glued parts

Other question for you as 928 specialist : my idle is not stable when engine warm( Kjet system) All fuel pressures are ok. Car runs fine and accelerates perfectly . I have also vacuüm meter and it is stable @ -0,5 bar.
i thought I solved the issue by making it richer via the CO mixture screw. It worked directly But next day I had the problem again😟

GerritD

Bad news : I have again coolant loss on top of my engine so the JB Weld held for about 3 months..damn....
I need to look for a more solid solution because I want to keep my engine...Perhaps another product ? Could the temperature (100°C) of the engine be the reason ?

Petza914

Oh No! That's a bummer. I was skeptical whether that would stand the test of time. Maybe someone can weld it for you with the engine in the car once you remove the stuff in the way.

Shark2626

Just reread your thread from the start, almost every option was presented. There were some additive products mentioned by brand name, but if you go that route you may want to do additional research for newer, more advanced products of that type. Good luck!

GerritD

Well, if welding cannot be done, I can still try the other epoxy option : Belzona 1111. about 200$ for 1 Kg ! Quite expensive but less than a used engine M12 (hard to find by the way, even in Europe)...
I need to check if the leak is at the same place, because if it leaks at the other long side of the crack, I am afraid my engine could be lost

GerritD

Stan, is Belzona 1111 sufficiently resistant against high temperatures ? Because the heat at the crack can go easily to about 100°C (212 °F)
So I do not know the max dry & max wet temperatures of Belzone 1111

Graham Bates

Looking at the last photo of the finished job I think it would have been better if you used heat from a hot air gun to start the curing process and allow some glue into the crack. The preparation with the abraided surface looks OK and if the area is properly degreased then that glue will hold at that temperature. It certainly does on my race car. I would do the same again but this time apply plenty of the JB Weld and apply heat from a hot air gun until the glue smooths out. The glue should end up with a glossy smooth finish.

Graham Bates

To make double sure of a lasting repair you could take a piece of 1mm aluminium sheet cut to just oversize of the repair. Panel beat the sheet to fit in that V section and glue that in place with a nice thick layer of JB Weld. Apply heat to the alloy sheet and push the sheet in enough so that there is still a layer of glue behind it and the glue oozing out is smooth and glossy.

GerritD

Hi Graham, the thought of a heatgun also crossed my mind, but in order to make JB Weld more fluid, it apparently needs some aceton
My fear is that JB weld cracked by heat of the engine since it is rather tough when dryed.
So as soon as I have dismantled the intake spider, it will reveal to me what went wrong.

Graham Bates

Do not add acetone to the glue. The glue can be made to run like water with a hot airgun. Have a practice with some scrap aluminium and study the effects.

GerritD

well I think I am going this time for belzona : https://www.belzona.nl/belzona-1212

apparenrly it is also in the offshore business to fix oil pipes, even under water.

It is not cheap : 150$ for 450gr but I will try again as it is still cheaper than new engine and is a Quick fix