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Search: Posts Made By: Dave Neptune
Forum: Exhaust System 06-22-2022, 04:28 PM
Replies: 12
Views: 313
Posted By Dave Neptune
That would be good. You can move the Injection...

That would be good. You can move the Injection point up a bit, far less to wrap and cooler for the engine area.

Dave Neptune :cool:
Forum: Exhaust System 06-22-2022, 04:02 PM
Replies: 12
Views: 313
Posted By Dave Neptune
That would be good. You can move the Injection...

That would be good. You can move the Injection point up a bit, far less to wrap and cooler for the engine area.

Dave Neptune :cool:
Forum: Exhaust System 06-22-2022, 02:53 PM
Replies: 12
Views: 313
Posted By Dave Neptune
That exhaust is a poor design! The injection...

That exhaust is a poor design! The injection point should be far below the "el with the injection nozzle" as water could easily get in during cranking.

The exhaust hot section should rise up a...
Forum: Exhaust System 06-22-2022, 01:36 PM
Replies: 12
Views: 313
Posted By Dave Neptune
First are you raw water cooled or using an heat...

First are you raw water cooled or using an heat exchange?

In a raw water cooled engine the cooling water exits from the exhaust manifold to a anti-syphon valve then to the exhaust hot section,...
Forum: General Interest 06-20-2022, 10:47 AM
Replies: 2
Views: 231
Posted By Dave Neptune
Bill, I spoke to Mo about 3 months ago on the...

Bill, I spoke to Mo about 3 months ago on the phone regarding a power boat I was interested in. Anyway that was the last I heard from him.

Dave Neptune :cool:
Forum: Exhaust System 06-19-2022, 08:46 PM
Replies: 3
Views: 162
Posted By Dave Neptune
As I recall the "studs" were exposed to the water...

As I recall the "studs" were exposed to the water jacket in the block. The "through-hole" for the studs are solid material with no exposure to water or the intake and exhaust runners. A big reason...
Forum: Fuel System 06-19-2022, 06:38 PM
Replies: 8
Views: 380
Posted By Dave Neptune
Ken would certainly know more about the A-4 pump...

Ken would certainly know more about the A-4 pump than I from experience. However I still feel that a check valve may be weak. I installed on my boat and a few others a new water/filter separator with...
Forum: Exhaust System 06-19-2022, 06:32 PM
Replies: 3
Views: 162
Posted By Dave Neptune
Good to hear the pump was just an air pocket. ...

Good to hear the pump was just an air pocket.

Do you have a lock washer on the bolt? They will leak out of the "split" if water is leaking to the bolt somewhere. Bolt torque could be a factor...
Forum: Troubleshooting 06-19-2022, 02:41 PM
Replies: 8
Views: 229
Posted By Dave Neptune
Simple TDC test

Watching a valve close is OK if it is on the right stroke. Remember that the exhaust stroke at TDC has the exhaust closing as the intake is opening, this is called "over-lap" as both valves are...
Forum: Troubleshooting 06-18-2022, 09:35 PM
Replies: 8
Views: 229
Posted By Dave Neptune
Double check that the choke is closing all the...

Double check that the choke is closing all the way. If there is fuel in the carb during cranking and the choke is closed seeing a bit of fuel in the throat is normal if the carb is functioning...
Forum: Troubleshooting 06-18-2022, 04:50 PM
Replies: 7
Views: 364
Posted By Dave Neptune
If all fuel lines before the pump are indeed...

If all fuel lines before the pump are indeed tight you very likely have a bad fuel pump as your gage indicates. Doubtful the fuel turned bad since the last run. If you find no water in the filter...
Forum: Ignition System 06-16-2022, 06:23 PM
Replies: 3
Views: 296
Posted By Dave Neptune
Bryan, you are describing a classic "bad plug",...

Bryan, you are describing a classic "bad plug", not real common but they're out there. If you had a good spark from that wire it has to be the plug.

If you wish to confirm just switch it out with...
Forum: General Maintenance 06-16-2022, 09:44 AM
Replies: 10
Views: 388
Posted By Dave Neptune
Question Peter, when you changed the oil did you always...

Peter, when you changed the oil did you always use the same "weight and grade" of oil? And did you always have the same percentage of MMO in the oil upon your start up?

The numbers are not bad at...
Forum: Drawings and Schematics 06-15-2022, 11:29 AM
Replies: 8
Views: 5,441
Posted By Dave Neptune
You can disconnect the hose from the pressure...

You can disconnect the hose from the pressure side of the pump and drain the block into a bucket or the bilge. Then disconnect the hose from the "high side" of the manifold which should be the...
Forum: Drawings and Schematics 06-14-2022, 08:59 PM
Replies: 8
Views: 5,441
Posted By Dave Neptune
Question I see you posted twice and in both posts I did...

I see you posted twice and in both posts I did not see a reason for an "acid flush". An acid flush is usually only done if you are having a heating or over heating issue.

What you are doing with...
Forum: Fuel System 06-14-2022, 12:37 PM
Replies: 8
Views: 380
Posted By Dave Neptune
One of the "check valves" the suction side has...

One of the "check valves" the suction side has failed, has dirt under it or the diaphragm is compromised. Since no fuel odors in the oil should be an easy fix with the rebuild kit.

Dave Neptune...
Forum: Electrical 06-12-2022, 02:24 PM
Replies: 69
Views: 2,881
Posted By Dave Neptune
Exclamation Good advise

The voltage regulator controls the alternator which controls the output voltage, NOT THE BATTERIES.

The early and late A-4's were even shipped from the factory with a ballast resistor. Once you...
Forum: Exhaust System 06-10-2022, 08:09 PM
Replies: 7
Views: 374
Posted By Dave Neptune
The salts will get there when the exhaust is...

The salts will get there when the exhaust is cooling down. My big concern is electrolysis due to all the dissimilar metals, kind of a battery of sorts.

Dave Neptune :cool:
Forum: General Interest 06-09-2022, 11:33 AM
Replies: 5
Views: 294
Posted By Dave Neptune
Keel bolts if so equipped, rudder bearings,...

Keel bolts if so equipped, rudder bearings, rudder post, strut and bearing as well as any thru hulls.
Look for dry rot around all bulkheads and deck fittings including the anchor stuff.

RE a...
Forum: Fuel System 06-05-2022, 09:37 AM
Replies: 17
Views: 749
Posted By Dave Neptune
Nick, any questions or answers? Dave Neptune...

Nick, any questions or answers?

Dave Neptune :cool:
Forum: Troubleshooting 06-05-2022, 09:36 AM
Replies: 5
Views: 385
Posted By Dave Neptune
The prop is not coated from Indigo. It is just...

The prop is not coated from Indigo. It is just std build up that needs to be scraped off. You should not need any balancing and antifouling on a prop just does not last. I had my boat hull and prop...
Forum: Fuel System 06-04-2022, 08:16 AM
Replies: 2
Views: 216
Posted By Dave Neptune
Red face I worked in an outboard shop as a kid and we...

I worked in an outboard shop as a kid and we regularly had customers bring in their OB because the water pump was failing since they could not see water coming out of the "pedo tube". Ninety nine...
Forum: Exhaust System 06-04-2022, 08:10 AM
Replies: 4
Views: 350
Posted By Dave Neptune
If part of the exhaust pipe has collapsed and...

If part of the exhaust pipe has collapsed and crumbled the rest is ready to go and the water injection point is probably plugging up too. Just plain ole time to replace.

Under no condition should...
Forum: Exhaust System 06-03-2022, 07:27 AM
Replies: 4
Views: 218
Posted By Dave Neptune
Thumbs up Normal

Yes, the black pipe will emit a bit of oil fumes, hand prints and anything the wrap absorbed which is normal for at least a few hours. A couple more cycles of hot to cold and it should begin to fade...
Forum: Fuel System 06-02-2022, 11:51 AM
Replies: 17
Views: 749
Posted By Dave Neptune
Thumbs up Very durable carb

Like Neil, I ran the same fuels in the same carb for 34 years. I had it apart many times playing with jets, air correctors and float levels to get the carb the way I liked it. I did replace the bowl...
Showing results 1 to 25 of 500

 
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