140 RUNNING (& DYING & SCREECHING) AGAIN

[SSTKO81]

Ok so here's the latest. The drive was removed to find that 1: the water o-ring in the drive was not installed. 2: the alignment was off. 3: even after all that it won't start and run. Still cranks fine, but begins screeching terribly when trying to run under its own power. Also getting an awful lot of smoke and backfire through the carb.

 

[SSTKO81]

I thought maybe, given the backfire I was 180* out so I pulled the distributor and spun the rotor 180 and put it back, set TDC time and tried to start. I didn't hear any screeching what-so ever but lots of smoke from the carb and it didn't sound like it wanted to start at all. So I put it back the way I'd had it previously. -tried to start and it ran for about 30 seconds timing was jumping around 8-10 BTDC at this point. And I've stopped there.

 

[SSTKO81]

Weirdest part to me is that it only makes this noise while under its own power, not while cranking. I'm wondering if it could even be ignition related

 

[Rick Stephens]

Compression check. Leak down. Determining motor quality seems to be the next step.

 

[SSTKO81]

Compression check. Leak down. Determining motor quality seems to be the next step.

Compression:
Cylinder number one 100 psi.
Cylinder number two 90 psi
Cylinder number three 110 psi
Cylinder number 4, 0 psi (95 after putting rocker arm back on)

Thought that rocker arm would solve my problem -the valve just stuck for some reason. But still just more of the same. -I believe I've got some other issues working as well as I noticed a little fuel that appeared to be coming from the rear of the intake manifold and running down the block

 

[Bondo]

Compression:
Cylinder number one 100 psi.
Cylinder number two 90 psi
Cylinder number three 110 psi
Cylinder number 4, 0 psi (95 after putting rocker arm back on)

Ayuh,.... That motor is a rebuildable core motor,.... Not a Runner with those numbers,....

 

[SSTKO81]

Ayuh,.... That motor is a rebuildable core motor,.... Not a Runner with those numbers,....[/QUOTE

Should still run tho even with the lower compression, right? It won't even start and the chirping is still there. Is it worth it to give another head gasket a shot?

 

[SSTKO81]

I'm still dinkin with this thing. Started a slow tear down process because even if I have to replace the whole engine it come out easier is pieces. I found that intake manifold gasket doesn't look to have been properly sealing and the carb may have a float stuck or something cause it still is wet with fuel down the throats and there's a lot of gasoline all over and inside this intake. There's a lot more here than meets the eye I'm afraid. I'm hesitating on pulling the head off but my better judgement tells me might as well while I'm Here

 

[RaceCarRich]

The hammering on of a damper can hurt thrust bearings. I'ld pull the oil filter and cut it open for inspection. If you don't have a filter cutter, poke a screwdriver hole and use some tin snips. Cheap enough test...

 

[RaceCarRich]

Also, what was done to the engine when it had its out of body experience? Was it rebuilt or... ?

 

[Bondo]

Should still run tho even with the lower compression, right? It won't even start and the chirping is still there. Is it worth it to give another head gasket a shot?

Nope,..... Yer beatin' a Dead horse,.... 100 psi, is Not enough compression,....

It's a rebuildable core motor, not a runner,...

 

[SSTKO81]

Nope,..... Yer beatin' a Dead horse,.... 100 psi, is Not enough compression,....

It's a rebuildable core motor, not a runner,...

** Deep Sigh ** I hate that I know you're right... time to start browsing craigslist I guess

 

[Bondo]

I hate that I know you're right...

Ayuh,..... Times like this,...... I hate it too,....

 

[SSTKO81]

Update* I did finally get the 140 started. Points were corroded. So cleaned them up and Whala! I was able to set time, adjust the carb and she ran at 6-700 rpm right up till she ran thru her 1 gallon of gas. Still has that terrible screech noise -kinda comes and goes, turns into more of a knock as RPMs increase. I'm sure bottom end on the motor is toast but it was good to at least get it running.

 

[bentle]

Just a thought here. Is there a chance at all that your harmonic balancer has a spun hub. Yes kinda like a prop but with all the hammering it just made me wonder. Have you rechecked trimming marks with tdc? Could that screeching be coming from your balancers hub being spun or slipping?

 

[SSTKO81]

Just a thought here. Is there a chance at all that your harmonic balancer has a spun hub. Yes kinda like a prop but with all the hammering it just made me wonder. Have you rechecked trimming marks with tdc? Could that screeching be coming from your balancers hub being spun or slipping?

Anything is possible with this engine.... while I had it running yesterday I stuck a stethoscope to the block along the cylinders and didn't hear anything. The noises really seem to come from up near the timing cover. -that's the last thing I messed with before putting this engine back in the boat. The front seal was leaking so I pulled the balancer and cover, removed the old seal and knocked in a new one. I then as gently as possible, dead blow hammered the balancer back on. I checked timing twice yesterday and I'm not seeing any movement or smelling anything at the balancer but I'll put reference marks on it and keep an eye out.
Admittedly I didn't use a gasket when resealing the timing cover, just used a bead of silicone. -and now that I'm writing this out I wonder if that's where my screw up is.......

 

[bentle]

I would get the proper gasket for your timing cover if it were me but I have heard of silicone used in it's place, as long as it's not leaking oil then your probably ok there. I don't see how the screeching sound would or could be coming from the use of silicone but hey ya never know. I'm still thinking it's harmonic balancer related either by what others have already stated or a spun hub. Check your timing marks after finding TDC on cylinder one and see if they line up. I do mean manually and not by timing light.

 

[G_Hipster]

Hammering the balancer on can damage the thrust bearing and that sure sounds like a bearing squeal if I've ever heard one.

 

[SSTKO81]

No Title

So we're talking main bearings here? Correct?

 

[SSTKO81]

The hammering on of a damper can hurt thrust bearings. I'ld pull the oil filter and cut it open for inspection. If you don't have a filter cutter, poke a screwdriver hole and use some tin snips. Cheap enough test...

-did find glitter all over the filter