Compression release briggs vtwin model 441777

[ronnierepairman]

Hello,
I have a briggs 441777
Type 0283 E1

Wouldn't crank .. and barely with the plugs out.. so I got a battery.
Then it would crank with plugs out but hang up on the compression stroke..
So I assumed the compression release broke..
Took it apart and it looks like it doesn't have one.. I've never seen that before however I've only taken about a few briggs motors..
So does this not have a mechanical release?? If so, is it just an exaggerated lobe ?
If so I'd assume that the valve adjustment is critical and is probably the problem??

 

[ILENGINE]

From the pictures of the camshaft that I find it does show an ACR.

 

[Scrubcadet10]

Yep, it's similar to the Intek single cam.

 

[ronnierepairman]

Yep, it's similar to the Intek single cam. View attachment 66893View attachment 66893

that is interesting..
i couldnt see it however i did not take out the cam..
there are definitely no parts in the bottom of the case but i suppose its possible that the
acr is stuck closed ?

the other thing is, i think the replacement cam does have the ACR.. so maybe it did not have one from the factory"?
I read some posts that indicated that the factory cam had exaggerated lobes to hold the valve open a bit longer to relieve compression

 

[StarTech]

It depends if he has the 790562 cam or the newer 797242 cam. The older cam did not have an ACR but the new one does. If replacing the camshaft you should be getting the new 797242 camshaft.

The older 790562 camshaft looks like this.

 

[ronnierepairman]

It depends if he has the 790562 cam or the newer 797242 cam. The older cam did not have an ACR but the new one does. If replacing the camshaft you should be getting the new 797242 camshaft.

The older 790562 camshaft looks like this.
View attachment 66894

yup.. it looks like the older cam.
so maybe the valves are too loose.. might just get the updated cam

 

[ronnierepairman]

anyone know where i can get the bolt torque specs for this motor?

 

[StarTech]

The only to these specs is the sump torque has been increases to 325 in / lbs. per the latest gasket kit. Of course that does fix my current gasket blow out problem. Hunting for cause now.

 

[ILENGINE]

Sump bolt torque is 325 in/lb. Be aware that the new OEM sump gasket also comes with new bolts, and you will need to chase the sump bolt holes in the block to remove any old thread lock prior to assembly with new gasket and bolts

 

[Walt 2002]

Well of course the cam shaft for all B&S V twins have compression release. The original Intek series used the age old Intake valve cam lobe grind where the Intake valve is held slightly open well into the compression stroke relieving compression.
Walt Conner