3.6 300hp johnson reed problems ?

[power house]

blows out air in number two carborator instead of sucking in and compression fluxuates between alternate cylinders. Lacks power and cuts out from time to time. Compression good in all eight cylinders. I think that a reed valve is stuck. Motor usually tacks about 7200 rpm now I can only get 6200 rpm. What do you think?

 

[Hooty]

Re: 3.6 300hp johnson reed problems ?

I think spinnin' that thang 7200rpm is a might tight. Reeds don't usually stick open, they break, and when they do, (unless you've got fiber reeds) the engine tries to digest them and can't. The results is a grenaded engine. If you suspect you've got a broken reed, stop runnin' it, pull the intake manifold and have a look.<br /><br />c/6<br /><br />Hooty

 

[power house]

Re: 3.6 300hp johnson reed problems ?

if it is not a valve then what could it be. the motor is a 1986 3.6 johnson gt vro v8 300hp.

 

[Hooty]

Re: 3.6 300hp johnson reed problems ?

I didn't say it wasn't a reed. I said if you suspect it's a broken reed, pull the intake manifold and check. Better safe then sorry 'er somethin' like that. <br /><br />c/6<br /><br />Hooty

 

[seahorse5]

Re: 3.6 300hp johnson reed problems ?

It is very common for the thin reed box to intake manifold gasket to "suck in" or to tear. That gives the same symptom as the broken reed, but is a lot cheaper to repair.

 

[Hooty]

Re: 3.6 300hp johnson reed problems ?

Didn't think about that. That would explain why nothin' got wrecked.<br /><br />c/6<br /><br />Hooty

 

[evin300]

Re: 3.6 300hp johnson reed problems ?

Had the same problem on my 89 4.0 V-8. That darn gasket sucked away at 150 hours. No harm done though.

 

[2strokeit]

Re: 3.6 300hp johnson reed problems ?

http://www.mychevytruck.com/showownerpic.asp?u=4675&n=94627&pos=9 <br /><br />.............Here is a pic of EVIN300s very V8

 

[OBJ]

Re: 3.6 300hp johnson reed problems ?

But guys...power house said it's blowing out #2 carb. I don't think the reed needs to be broken. Could be bent or cracked really bad.<br /><br />Unless I'm reading the post wrong, I'd say he has a reed problem. If he truly has been taching out at 7200rpm, It would not surprise me if the reed is bent.<br /><br />Perhaps he could pull the carb and take a peek through the hole with a flashlight.

 

[power house]

Re: 3.6 300hp johnson reed problems ?

broken reed valve it is. thanks all

 

[G DANE]

Re: 3.6 300hp johnson reed problems ?

Power House<br /><br />I was luckey to find mine behind the bypass cover. No harm done.