1993 nautique won't run over 3200 rpm |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Posted: August-03-2014 at 2:17pm |
It might be possible that the wrong rebuild kit was used?
I know Holleys are very sensitive to where the holes are in the gaskets. Not sure if that could fully cut off the fuel though. Of course, maybe the bowl is getting fuel it's just not making it to the jets. Does the wrong gasket causing this sound plausible to anyone? |
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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Unfortunately I have no recourse with the rebuild. He's since gone out of business(imagine that) even looked at the old repair bill and paperwork and he even put on there he tested it on the water and top rpms were 3500? Should have know then. Apparently he didn't even try to fix the secondaries and new they weren't working right.
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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It's good that the boat is nearby. That makes things easier.
You're right there are no external adjustments. I don't think blowing air will help you. You'll at least have to remove the rear bowl. I reread the start of the thread, and looks like you had this carb rebuilt already... Do you have any potential recourse there? If not, I'd be tempted to spring for a new carb or at least a known, trusted factory rebuilt one. I think Holley even sells rebuilt ones direct. |
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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Since my carb abilities are limited would it be an option to disconnect the main fuel line to carb and blow air through to see if the lines to the secondaries are even open. Not sure this is even a good idea just thinking out loud.
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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Yes the boat stays at my house. After doing a quick you tube search on float level adjustment, I believe my carb has no external adjustments for the float level?
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Well, unfortunately, there isn't really a way outside of taking things apart.
Is your boat always accessible to you? In other words, do you travel to your boat and the water, or does the boat stay with you and you take it to the water? Just trying to figure out the best way to approach this. Either way, you're going to want to get a good quality rebuild kit. Your task may be limited to just unscrewing and removing the rear fuel bowl. But, even for that, you'll need a bowl gasket and potentially the transfer tube Edit: "O" ring gaskets, which would be contained in the kit. |
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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Well by now you know what is coming next!
How do I check those things? |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Well, there is at least some spring pressure you're working against.
Well, the fact that it dies tells me you're not getting and fuel to the secondary bowl. Either something is plugging up the fuel transfer tube, or the float for the secondary bowl is adjusted incorrectly or the needle is stuck somehow. |
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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Alright finally got back to the boat. I pulled the linkage loose and when I manually open the secondaries it dies. It is kinda hard to open the from the completely closed state I'm assuming vacuum pressure holds them closed?
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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One test, while it's idling in neutral, on the trailer or whichever:
See if you can rev it up a little using just the secondaries. You might have to disconnect the linkage to that cam, but on mine, the cam will let me open the secondaries a little. Just wondering if you're getting any fuel at all to the secondaries. |
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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It is the "cam" that is held closed by the throttle linkage. It keeps the secondaries closed until the throttle is wide open I believe. Before I fixed the firing problem, if you manually engaged the secondaries under wide open throttle it fell on its face like it wasn't getting enough fuel? As soon as you took pressure off of the secondary valve (valve on drivers side that has rubber diaphragm and spring in it) it would close back on its own.
It is still doing the same thing after firing problem is fixed. Just does it at a little higher rpms now |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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In your very first post, you mentioned a cam closing again, once you were on plane. Do you have any idea what part of the carb that is? That detail has me curious. |
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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Finally put boat in the water today. No stumble, no backfire nothing. I could get the rpms to about 3700 steady. When I eased forward on the throttle and I mean barely move it at all, it would was up to about 3950 then fall backdown to 3200. Ease back in the throttle a little and right back to 3700 with no problem and stay there. It almost seemed to me if the problem now is when the secondaries open up it fails then goes back to an rpm it can handle.
Thanks a bunch for your help in the firing that sure cleared up all the stumble and backfire problems. From idle, I can gouge it and it never misses a lick, hits plane instantly! |
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backfoot100
Platinum Member Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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Probably not but check it. If it's clean and at the right level, don't worry about the oil.
As for the carb, don't worry about that right now either. Make sure it runs first. The throttle plates will probably clean up OK but not the choke plate. I would take the carb off and clean it up with some carb cleaner and reinstall, but that's me. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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With all of the backfiring, Im assuming it was dumping fuel on an open valve? If that is the case, do I need to change the oil and filter now. Also do I need to clean all the black oily fuel off of the choke plate and in the primaries in the carburetor before I run it much or will it just burn off? Still haven't had time to run it but am trying to think ahead before I get too carried away if it does run good.
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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Unfortunately no. Hopefully I will tomorrow afternoon.
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13514 |
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Which is RH. You are on the right path. |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Nice!
Have you gotten a chance to test it out? |
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JPASS
Grand Poobah Joined: June-17-2013 Location: Orlando Status: Offline Points: 2283 |
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I thought the rotation was designated in the 2nd letter of the model number on the engine tag. PRP is right hand rotation. PLP is left (standard). No?
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'92 Correctcraft Ski Nautique
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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I checked rotation again, sitting in drivers seat looking at motor, engine rotates counterclockwise.
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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2and 3 were swapped!!!
It was 18456372 instead if 1845627. Choke plate is setting at about 3/16" open now and are slowly opening. There is black crap all in the primaries and on the choke plate. |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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This is the distributor on my RH motor. Make sure yours is definitely RH. Keep in mind, your rotor turns counter clockwise, regardless of rotation. The exact position of the #1 depends on how the dizzy is set up, but the wires relation to one another is important.
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Here is the cylinder layout
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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Ok another newbie question or two. Choke plate, is that the plate that is over the primaries on the carburetor? If so I believe that mine stays open all the time.
Second one is about firing order and cylinder number location. If I am standing in front of the engine like in the second picture, how are the cylinders numbered. Also I looked at the firing order in the manual and not sure where to start on the distributor. Is the drawing based on standing in front of the motor looking back at it or standing at the back end of the motor? Sorry for the questions but I want to get this right. Thanks again. |
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JasonS
Groupie Joined: July-24-2012 Location: Batesville, AR Status: Offline Points: 55 |
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Thanks for the help, Ill check that as soon as I get home and post the results.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21171 |
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18456273
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Page 17 of the original manual, which is page 21 of the PDF, has the information you need to check the firing order:
http://www.correctcraftfan.com/Downloads/1993_PCM_Engine_Manual.pdf |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Good point Tim, I didn't think about that.
But, it still sounds to be like some plug wires are crossed or the spark is arching somewhere. |
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backfoot100
Platinum Member Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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So it's never run right since you've had it? Brian is right. If the crank is rotating CCW as you describe, it's a RH rotation. The pics look like it's canted back at a pretty good angle which would indicate a 1:1 BW tranny and all 1:1 trannys were RH which is pretty rare in that year boat but certainly possible to have. Like Tim said, only having 4 or 6 cylinders working unloaded on the trailer can run pretty well but will do exactly as you describe loaded on the water. Unfortunately, I can't help with firing order in that engine. I've seen a couple different ones on the Ford engines so someone will have to verify what that would be. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21171 |
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A v8 will start and run surprisingly well on 6 or 4 cylinders (1 or 2 sets of plug wires crossed), but it will not run on 1 cylinder- which is what you'd e trying to do with a LH firing order on a RH 351w.
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