The Whistling Land Cruiser

[N919HJ]

It could be the carb insulator too.

 

[HeadHunter6]

I fixed the whistling — it was the intake manifold warpage which has created the gaps — sanded them down flat and reinstalled — no whistling now

 

[dkcrew]

Mine started whistling last week. I put on new gaskets and the whistling got worse. I then started looking at the adapter plate and could feel that it's not perfectly smooth - you can see it up in the top middle. I suspect at some point there was some type of gasket. I tried sanding this off ... still whistling. I hope it's not the base of the intake. I may try to find another adapter plate and see if this fixes it for me.

 

[firemanj92]

Mine started whistling last week. I put on new gaskets and the whistling got worse. I then started looking at the adapter plate and could feel that it's not perfectly smooth - you can see it up in the top middle. I suspect at some point there was some type of gasket. I tried sanding this off ... still whistling. I hope it's not the base of the intake. I may try to find another adapter plate and see if this fixes it for me.

View attachment 3692661

Those insulators had factory gaskets glued to them on both sides. I think redline cruisers sells new insulators and SOR. I've gone through purchased both and would recommend Redline's over SOR (quality or price)

 

[dkcrew]

I finally put a stethoscope to locate the whistling and the remflex gasket is not 100% sealed right in the middle of the intake at the manifold. I may try tightening those bolts and checking torque. I did put a new adpater plate and normal vacuum went from 16 to 18-19 with no other changes so I did eliminate one of the 1 vacuum leaks.

 

[N919HJ]

Mine luckily fixed itself. I haven’t heard any whistling in years. Thanks for sharing what you found. I’m sure I’ll have to deal with it someday.

 

[dkcrew]

I keep hoping for it to fix itself but it looks like I will finally get a few minutes to work on it tomorrow evening.

 

[Paul_A]

I've debugged whistling and other various fan belt and vacuum noises by squirting a bit of water on certain spots while running to see if the sound changes. For anything intake related you could use carb cleaner, I guess. Just a squirt, not a deluge.

 

[dkcrew]

I put a bit of copper sealant around the vacuum leak in the intake (pic a few posts up) and it's been good for the past week with ~100 miles on the truck. I suspect this is temporary but it's driving better than ever at this point.