3.Ol flywheel hitting starter at high rpms

[snake91876]

hey guys i found my noise in my engine the flywheel is actually cutting into the starter about an 1/16 to a 1/8" at high rpms i get the random ping , what could be causing this? i shimmed starter but that doesnt move starter out it moves it down.

 

[Bondo]

Re: 3.Ol flywheel hitting starter at high rpms

Ayuh,......

Gonna need Alot of History,....... Something is Very Wrong...........

 

[snake91876]

Re: 3.Ol flywheel hitting starter at high rpms

rebuilt 3.0l this summer rod bearings, rings only, mains were labled and put back in same locations including thrust low hours looked new the only reason i took it apart was due to a blown head gasket . new gaskets, rear maing seal . i have had a mysterious metallic sounding noise pinging every so often in engine at high revs, i took starter off and found the flywheel is rubbing a spot in it about 1/16 or so deep on a curved spot of about 1" , i can sit at idle with no noise and slowly rev i get the metallic noise starting about 3500 rpms and when i let out it just dies off. the boat runs great but i know something is not right, my starter can be moved on my bolts it seems just a little , please help me

 

[Bondo]

Re: 3.Ol flywheel hitting starter at high rpms

my starter can be moved on my bolts it seems just a little ,

Ayuh,.........

I guess I'd start by pulling the Starter,.....
Then taking the Bolts to a Parts House,+ getting a New pair,.....
The 1s with the Knurling on the shank of the bolt,... It takes up the slack in the casting, for a tighter fit.....

Did you check the Thrust,+ End-play of the Crankshaft when you had the chance,..??

 

[snake91876]

Re: 3.Ol flywheel hitting starter at high rpms

it is endplay causing this bondo i just pryed the crank and damper back a slight bit an my noise went away , what is going on and will it move right back am i looking at engine failure

 

[Bondo]

Re: 3.Ol flywheel hitting starter at high rpms

it is endplay causing this bondo i just pryed the crank and damper back a slight bit an my noise went away , what is going on and will it move right back am i looking at engine failure

I Donno,..... Sounds like you shoulda mic'ed the crank,+ replaced the Mains......

Were the Bearing Surfaces Mirror Smooth,..??

 

[snake91876]

Re: 3.Ol flywheel hitting starter at high rpms

yes , they were, where is the thrust surface at on this engine i cant quite remember , im wondering can i replace that

 

[Bondo]

Re: 3.Ol flywheel hitting starter at high rpms

Ayuh,.........

It's at the Rear Main I believe.....

 

[snake91876]

Re: 3.Ol flywheel hitting starter at high rpms

bondo would you run it until it moves back forward or would you take the engine back out now

 

[Don S]

Re: 3.Ol flywheel hitting starter at high rpms

This wouldn't be a Mallory gear reduction starter by any chance would it?

 

[snake91876]

Re: 3.Ol flywheel hitting starter at high rpms

im not sure its just black

 

[fishrdan]

Re: 3.Ol flywheel hitting starter at high rpms

i just pryed the crank and damper back a slight bit an my noise went away

Did you actually see or feel the crank move? The 3.0 crank's end play is supposed to be .002-.006",,, not enough clearance to where you should be able to noticeably pry back/forth and see the crank move (unless your using a dial indicator).

See if you can mount a dial indicator on the vibration dampner and then push/pull the dampner to see what the crank's end play is. You could also try to do this with a spacer block and feeler gauges to get a ball park guesstimate of the crank's end play. Either way is not going to be 100% accurate, but should show you if you have more than 006" of end play, a few sheets of paper thickness.

I just checked another section of Merc manual #13 and it has a procedure for measuring the flywheel's runout, supposed to be .008 max. Something you could do while the started is removed if you have a dial indicator.

Bondo was correct, rear main is the thrust bearing on a 3.0.

I could be off base here, just running with the comment of the crank moving back when you pried on it.

 

[fishrdan]

Re: 3.Ol flywheel hitting starter at high rpms

snake, sent you a PM.

 

[whywhyzed]

Re: 3.Ol flywheel hitting starter at high rpms

......

 

[snake91876]

Re: 3.Ol flywheel hitting starter at high rpms

i didnt actually see the crank move i pried between damper and front engine mount pullys were slightly misaligned maybe a 1/16" or so and when i drove a wedge between the front they lined up , maybe i just moved the damper

 

[buggiedad_67]

Re: 3.Ol flywheel hitting starter at high rpms

by chance you didnt put the flywheel on backwards when you reassembled??

 

[snake91876]

Re: 3.Ol flywheel hitting starter at high rpms

can it go on more than one way , the thick 2" rim is facing the front of the motor

 

[buggiedad_67]

Re: 3.Ol flywheel hitting starter at high rpms

nope i was wrong was thinking of something else on another froum

 

[fishrdan]

Re: 3.Ol flywheel hitting starter at high rpms

Any pics of the grinding on the starter?

 

[Silvertip]

Re: 3.Ol flywheel hitting starter at high rpms

Yes -- shimming the starter moves it down, but it also moves it away from the centerline of the flywheel. As was mentioned, check the bolts. Even if the main bearing carrying the thrust load was worn it would not allow that much longitudinal movement. If it was ok before, and not now, you did something wrong. Flywheel on backwards maybe.