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#435376 - 09/14/08 06:59 PM Re: Motor will not go above 2500 RPM????? [Re: prober]  
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Phill Offline
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Boise, ID
Well...

Timed it with the old rotor...12 degrees BTDC...

I adjusted it to 10 BTDC...she pulls 12" of vacuum...

Considering that Boise, ID is at about 3,000 ft elevation...this may not be that bad as the Seloc manual says that the engine vacuum should be between 15 and 20" at sea level...

Time to take her to Lucky Peak Resevoir, about 15 minutes away from my house...and test her out. I hope this works...keeping my finger crossed smile




Last edited by Phill; 09/14/08 07:00 PM.

1977 18' Marlin OMC/Ford 302 Stringer Drive
2003 F-150 Supercab 4x4 5.4L


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#435425 - 09/15/08 12:19 AM Re: Motor will not go above 2500 RPM????? [Re: Phill]  
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Phill Offline
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Just got back from the resevoir...

Had the same problem....then checked the timing after about 1/2 hour on the water...it showed 10 degrees ATDC (I KNOW I had set it 10 degrees BTDC). So I set the timing back to 10 BTDC...and it ran a lot better. I don't know why it moved as the distributor bolt was locked down. confused

The timing does advance...at 2K RPM it is about 30 degrees BTDC.

It runs rough when I bring it down to idle now...but runs a lot better at top end...still can't get it over 2500 RPM as the throttle cable does not push the throttle all the way open on the new carb...

Going to throw the old carb back on and see how it runs.


1977 18' Marlin OMC/Ford 302 Stringer Drive
2003 F-150 Supercab 4x4 5.4L


#435431 - 09/15/08 12:56 AM Re: Motor will not go above 2500 RPM????? [Re: Phill]  
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prober Offline
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Eastern Washington
I think it is time to pull the distributor and see if the shaft is broken. That would explain your wandering timing.

#459061 - 04/27/09 12:49 AM Re: Motor will not go above 2500 RPM????? [Re: prober]  
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Phill Offline
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Boise, ID
Well..

Dropped this over the winter...now it is spring!

I yanked the distributor...no broken shaft (from what I can tell..no play when I grab the rotor and the gear), advance weights move freely...Gear seems to have little wear on it...

I removed exhaust manifolds and pulled the valve covers...clean as a whistle, no sludge, no broken springs...the valve train seems in order.

SO...I decided to order a brand new fuel pump...sould be here this week.

I think the pump may be failing to deliver fuel when the engine needs it most.

FUEL or SPARK...it's gotta be one or the other.

I should just take my money and dump it in the lake smile


1977 18' Marlin OMC/Ford 302 Stringer Drive
2003 F-150 Supercab 4x4 5.4L


#459063 - 04/27/09 04:29 AM Re: Motor will not go above 2500 RPM????? [Re: Phill]  
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Titanium Offline
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Northern California
Phill,

You have me confused now (which isn't hard, according to my wife). You just ordered a new fuel pump, but according to your posts from last September you KNOW that something screwy is going on with your rotor which you KNOW is affecting the timing.

I would resolve the issue with your wandering timing problem before diving into other items. Perhaps it is time to consult with a marine mechanic or maybe an auto technician since the problem appears to be in the Ford engine? Replacing other parts before you solve the root problem of wandering timing is going to be confusing at best.

I also had a 1977 OMC Ford 302 V8 on a Beachcraft 18 foot runabout. I LOVED this engine and outdrive. The boat, while in good shape for its age, was certainly not built to todays quality standards. Also, the closed bow was a huge waste of space - the only thing it was good for was to be a black hole for life jackets.

Last edited by Titanium; 04/27/09 04:32 AM.

In theory, there is no difference between theory and practice. In practice, there is.

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05 Dodge Ram 1500 QuadCab 5.7L V8 Hemi
07 SeaDoo Wake 215, 1996 SeaDoo GTX, 05 HD Dyna SuperGlide
#459209 - 04/27/09 11:34 PM Re: Motor will not go above 2500 RPM????? [Re: Titanium]  
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Phill Offline
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Boise, ID
Originally Posted By: Titanium
Phill,

You have me confused now (which isn't hard, according to my wife). You just ordered a new fuel pump, but according to your posts from last September you KNOW that something screwy is going on with your rotor which you KNOW is affecting the timing.

I would resolve the issue with your wandering timing problem before diving into other items. Perhaps it is time to consult with a marine mechanic or maybe an auto technician since the problem appears to be in the Ford engine? Replacing other parts before you solve the root problem of wandering timing is going to be confusing at best.

I also had a 1977 OMC Ford 302 V8 on a Beachcraft 18 foot runabout. I LOVED this engine and outdrive. The boat, while in good shape for its age, was certainly not built to todays quality standards. Also, the closed bow was a huge waste of space - the only thing it was good for was to be a black hole for life jackets.


The jumping timing went away, maybe I set it wrong...but it held steady after two more trips...maybe I overlooked something frown I checked for a broken shaft on the distributor...none.. I just don't see where else there could be a problem...

I have owned two cars with traditional small block Ford V-8's (302 and 351W) and never had a problem like this.

If the fuel pump doesn't fix it, it's going to a boat mechanic.

The boat itself was made by Marlin Boats, Inc out of White City, Oregon. It's a closed bow (yeah, I agree, a waste of space). It's a well made boat, no rotten wood, and the hull is in good shape. It's built pretty solid....
I am contemplating buying a newer boat next year, maybe something with a Volvo or Mercruiser drive...or a large two stroke outboard..

Last edited by Phill; 04/27/09 11:41 PM.

1977 18' Marlin OMC/Ford 302 Stringer Drive
2003 F-150 Supercab 4x4 5.4L


#459212 - 04/28/09 03:09 AM Re: Motor will not go above 2500 RPM????? [Re: Phill]  
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Titanium Offline
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Northern California
Phill,

Sounds good. I'm rooting for the fuel pump to fix your problem for good.

Can you post the details of your boat and engine combo in your signature?


In theory, there is no difference between theory and practice. In practice, there is.

07 Cobalt 240 w/ Merc 496 Mag MPI V8 Bravo 3
05 Dodge Ram 1500 QuadCab 5.7L V8 Hemi
07 SeaDoo Wake 215, 1996 SeaDoo GTX, 05 HD Dyna SuperGlide
#459224 - 04/28/09 08:50 AM Re: Motor will not go above 2500 RPM????? [Re: Titanium]  
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Familyman Offline
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If I am understanding your earlier posts, it won't go above 2500 rpm in gear but in neutral it will rev just fine, Is that right? Have you considered you shift interupt switch? When the one on my bayliner when bad a few years ago, I found one of the wires corroded right at the switch. Mine was at the shifter linkage and had a small gauge wire running to the coil. It is there to retard the the timing at the moment you shift into gear to take some of the pressure of the drive. Just a thought I had.


"I didn't know how much I enjoyed life until I had kids"

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#459226 - 04/28/09 09:28 AM Re: Motor will not go above 2500 RPM????? [Re: Familyman]  
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Phill Offline
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Boise, ID
Originally Posted By: Familyman
If I am understanding your earlier posts, it won't go above 2500 rpm in gear but in neutral it will rev just fine, Is that right? Have you considered you shift interupt switch? When the one on my bayliner when bad a few years ago, I found one of the wires corroded right at the switch. Mine was at the shifter linkage and had a small gauge wire running to the coil. It is there to retard the the timing at the moment you shift into gear to take some of the pressure of the drive. Just a thought I had.


Hmmm...

I don't think my boat has one of these...but will look over the wiring diagrams to confirm....


1977 18' Marlin OMC/Ford 302 Stringer Drive
2003 F-150 Supercab 4x4 5.4L


#459257 - 04/28/09 03:24 PM Re: Motor will not go above 2500 RPM????? [Re: Phill]  
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prober Offline
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Even an engine running on half of it's cylinders will rev to redline just fine in neutral. Not only is revving in neutral not good for the engine, it does not tell you anything.

#459426 - 04/29/09 11:59 PM Re: Motor will not go above 2500 RPM????? [Re: prober]  
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Phill Offline
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.


Last edited by Phill; 04/30/09 12:29 AM.

1977 18' Marlin OMC/Ford 302 Stringer Drive
2003 F-150 Supercab 4x4 5.4L


#470289 - 09/07/09 04:22 PM Re: Motor will not go above 2500 RPM????? [Re: Phill]  
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Smoozyj Offline
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VA
I know this post is old. I thought I would reply anyway.

I had the same EXACT problem. It's in the carb. One of the jets was totally clogged. I almost missed it on the rebuild. The carb was giving enough fuel to run and tach up without a load, under load it would only run at idle speed about 1500RPM. I would start to feel some surging at the max point before the bogging down. Ethanol fuel gums up horribly in the off season. If your plugs check clean then you have a lean fuel problem and most likely the above. I would certainly check the jets before replacing the pump.

Hope this helps someone, I went through alot of things and spoke with alot of people before I found the problem.

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