5.7 omc stalling while shifting

[Nick_1987 5.7 OMC]

well I don't know if you can go lower in pitch than that so you need to look for other causes for the low rpm....because that's way too low and is causing a lot of engine strain every time you pull the boat up on plane, like trying to start up in a manual trans car in 3rd gear.
as in...
make sure when your throttle control is in WOT position, the throttle blades in the carb are in WOT position (accel cable adjustment)
check for any restrictions in fuel supply...large cannister filter....anti siphon valve on gas tank, fuel tank vent
any other carb issues, are the secondary air doors (also called air valves) opening properly on the Quadrajet, these are spring loaded vacuum operated doors that cover the secondary throttle valves which are mechanically operated, there is a spring adjustment on these...if the open too soon (spring to loose) it causes a bog when accelerating, if too tight may never open
Accel pump, the seals do wear out, so you have to replace it...
tune up and total timing advance as I said above, this is really important
if you go through each possible cause you'll get it. I started with a lousy 4200 rpm max at WOT, now it consistently pulls 5000 easy.

Yea the book says 15x13. I Have a 15x15

 

[itsathepete]

Where is point gap done, when the little ridge on the middle piece is in contact with the arm from the point?

When the cam lobe is contacting the breaker point there is no gap. The gap is when the contact point is between the lobes

 

[Nick_1987 5.7 OMC]

some pix of the Quadrajet air horn & main body....

Also how do I measure dwell angle?

 

[Nick_1987 5.7 OMC]

When the cam lobe is contacting the breaker point there is no gap. The gap is when the contact point is between the lobes

So before it hits a lobe there should be a gap of 0.018” like the specs? And when it hits a cam lobe there should be no gap and complete contact?

 

[Lou C]

Also how do I measure dwell angle?

You buy an engine analyzer hook it up start the engine & set to dwell, see my post # 31.

 

[Lou C]

So before it hits a lobe there should be a gap of 0.018” like the specs? And when it hits a cam lobe there should be no gap and complete contact?

No when it is on the high point (lobe) set it there.

 

[Lou C]

If you get a manual & read it through this will all make sense. This is what’s bad about the internet no one reads manuals anymore so people don’t know basics like how ignition systems & carbs work. If you don’t know how they work it’s hard to fix them right…

 

[Lou C]

Some of my light reading, dating back to 1972.
The internet is fine for certain things but for a broad base of knowledge and understanding, it is not. All you get are bits and pieces, not real understanding. And you'll never be a good mechanic without understanding.
So now start surfing ebay for that OMC shop manual....
and invest in a good engine analyzer, advance timing light, feeler gauges, etc.

 

[Lou C]

One day you too will be able to wear this shirt.....

 

[Nick_1987 5.7 OMC]

Some of my light reading, dating back to 1972.
The internet is fine for certain things but for a broad base of knowledge and understanding, it is not. All you get are bits and pieces, not real understanding. And you'll never be a good mechanic without understanding.
So now start surfing ebay for that OMC shop manual....
and invest in a good engine analyzer, advance timing light, feeler gauges, etc.

On my way to the store to get these tools. I managed to guess the gap and I was able to get back to my normal rpm and plane out. Starts ok, not as easy as before. But I’m only 3500rpm at WOT. The motor sounds good. But I’m gonna get a 15x13. Just like the book says.

 

[Lou C]

Does Bayliner have a chart that lists what props were standard with various engine options? I know Four Winns did, that's how I knew the 14.5x19 was wrong for the V6 but OK for the V8s. Here's the meter I use, and I have an old Sears Craftsman advance timing light....
Here's a pic close up of Chevrolet timing marks....where the hole is, that's zero or Top Dead Center, the marks to the left are Before Top Dead Center, the marks to the right of it are After Top Dead Center. TDC refers to the engine being on the compression stroke for #1 cylinder. That mark on the harmonic balancer, is what you're looking for with the timing light. When it flashes (when the plug fires) you'll illuminate that mark and it should be near the 8* mark on that timing tab.

 

[itsathepete]

No when it is on the high point (lobe) set it there.

This is correct. I was thinking backwards but the lobe breaks the contacts and makes the gap. Been a minute since I did points

 

[Nick_1987 5.7 OMC]

Does Bayliner have a chart that lists what props were standard with various engine options? I know Four Winns did, that's how I knew the 14.5x19 was wrong for the V6 but OK for the V8s. Here's the meter I use, and I have an old Sears Craftsman advance timing light....
Here's a pic close up of Chevrolet timing marks....where the hole is, that's zero or Top Dead Center, the marks to the left are Before Top Dead Center, the marks to the right of it are After Top Dead Center. TDC refers to the engine being on the compression stroke for #1 cylinder. That mark on the harmonic balancer, is what you're looking for with the timing light. When it flashes (when the plug fires) you'll illuminate that mark and it should be near the 8* mark on that timing tab.

Ok so I gapped it right. 0.018” used a feeler gauge. Now what?

 

[Lou C]

Now check with the dwell meter, set timing & idle speed

 

[Nick_1987 5.7 OMC]

Now check with the dwell meter, set timing & idle speed

Can you send me a picture of the book I should get

 

[Nick_1987 5.7 OMC]

Now check with the dwell meter, set timing & idle speed

I ordered a swell meter from Amazon. Paid the extra money for a good one. Learned my lesson on cheaping out on tools in my early years…

 

[Nick_1987 5.7 OMC]

I ordered a swell meter from Amazon. Paid the extra money for a good one. Learned my lesson on cheaping out on tools in my early years…

Dwell*

 

[Lou C]

Can you send me a picture of the book I should get

post 48 above OMC Cobra shop manual

 

[Nick_1987 5.7 OMC]

post 48 above OMC Cobra shop manual

Ok perfect! Man you guys are the best… one more thing. How does my prop situation sound. Checked today, at WOT I’m doing 3500 rpm and doing 26mph fully loaded. Had 7 guys, 300 litres of fuel. Around 250 pounds of fish. I’ve read that I should be in the 4200-4600. What props should I test?

 

[Nick_1987 5.7 OMC]

post 48 above OMC Cobra shop manual

Also just ordered a timing light aswell.