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I've been wondering . . .

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Category: General Correct Craft Discussion
Forum Name: Common Questions
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URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=35398
Printed Date: November-24-2024 at 2:29pm


Topic: I've been wondering . . .
Posted By: GMacLaren
Subject: I've been wondering . . .
Date Posted: February-11-2015 at 5:19pm

This photo of my '77 American Skier shows how the routing of the raw water inlet hose forms an inverted "P-trap" of sorts:




I'll guess this is done to keep water in the pump (and primed) when the boat is out of the water, or engine not running.

The '72 Skier I'm rebuilding did not have this "loop" in its hose routing when I acquired it. It will be a month or two before we do the plumbing on that boat. I'm wondering if I should route the new hoses like the '77 -- or will the height of the transmission cooler mounting provide enough of this "lift" to keep water in the pump? (I can mount the '72's cooler higher than it was when I acquired it.
Another question -- why does the '72 have TWO thru-hull pickups, yet the '77 (and other boats I've experienced) have only one.

-=Grant=-



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-=Grant MacLaren=-
Retired Expert
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Replies:
Posted By: skutsch
Date Posted: February-11-2015 at 5:23pm
I also have never seen one with 2 pick ups, where are they located?

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Posted By: GMacLaren
Date Posted: February-11-2015 at 5:31pm
Originally posted by skutsch skutsch wrote:

I also have never seen one with 2 pick ups, where are they located?


Here they are on the '72:



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Posted By: Orlando76
Date Posted: February-11-2015 at 5:32pm
I believe Holman Moody's were dual. My Escort and dad's Waukesha are routed and set up just like your Waukesha.


Posted By: 8122pbrainard
Date Posted: February-11-2015 at 5:36pm
Originally posted by GMacLaren GMacLaren wrote:


This photo of my '77 American Skier shows how the routing of the raw water inlet hose forms an inverted "P-trap" of sorts:
I'll guess this is done to keep water in the pump (and primed) when the boat is out of the water, or engine not running.

No, it's just a routing convenience for the hose. No P trap needed. Enough water will stay in the RWP for a prime. It's the reason I always bump the engine over when draining for winter.
Originally posted by GMacLaren GMacLaren wrote:

Another question -- why does the '72 have TWO thru-hull pickups, yet the '77 (and other boats I've experienced) have only one.

Because Chrysler marines recirculated warm water back to one of the thru hulls. Take a look in the manual in the reference section at the cooling schematic.



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Posted By: 8122pbrainard
Date Posted: February-11-2015 at 5:42pm
Grant,
Since your Skier has a Ford, it was ether repowered at one time or more likely the factory installed dual pickups for ether a Ford or Chrysler. Times and money was tough back then so they never really knew which engines would show up first!

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Posted By: 8122pbrainard
Date Posted: February-11-2015 at 5:45pm
Originally posted by Orlando76 Orlando76 wrote:

I believe Holman Moody's were dual.

Yes, the H/M's were dual as well as some Interceptors but, the RWP 's have a common suction to dual cavities. My 312 is a good example.

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Posted By: TRBenj
Date Posted: February-11-2015 at 5:50pm
Every boat I've had from the late 60's an early 70's (when the dual pocket chryslers were common) had the dual pickups regardless of which engine was installed. The fords have the 2nd pickup looped as shown above. The chryslers (at least the earlier ones) had a dedicated line to each. Ease of manufacturing to always drill 2 holes I imagine.

The under/over tranny routing of the hose makes adding a tee easier, as well as draining the tranny cooler. Not sure id go out of my way to make the change on an older boat though... Might depend on how the trans cooler is mounted.


Posted By: GMacLaren
Date Posted: February-11-2015 at 6:09pm
The pickup hose on the '72 also has a strainer in line. If I do my boating on clean water lakes, is this device needed? A good idea? I've been thinking of not re-installing it when I do the plumbing.

-=Grant=-



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-=Grant MacLaren=-
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Posted By: 8122pbrainard
Date Posted: February-11-2015 at 6:12pm
Originally posted by GMacLaren GMacLaren wrote:

The pickup hose on the '72 also has a strainer in line. If I do my boating on clean water lakes, is this device needed? A good idea? I've been thinking of not re-installing it when I do the plumbing.

-=Grant=-


No, I have none on any of my boats. Evidently in the 80's, lakes got weedier/dirtier!

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Posted By: GMacLaren
Date Posted: February-11-2015 at 6:18pm
Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by GMacLaren GMacLaren wrote:

The pickup hose on the '72 also has a strainer in line. If I do my boating on clean water lakes, is this device needed? A good idea? I've been thinking of not re-installing it when I do the plumbing.

-=Grant=-


No, I have none on any of my boats. Evidently in the 80's, lakes got weedier/dirtier!


I thought it might have been included for boats being used in warmer waters, where plant growth might cause pickup problems. I had never seen one, 'til I got my first CC.

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Posted By: 8122pbrainard
Date Posted: February-11-2015 at 6:54pm
Originally posted by GMacLaren GMacLaren wrote:

   The pickup hose on the '72 also has a strainer in line.
I thought it might have been included for boats being used in warmer waters, where plant growth might cause pickup problems. I had never seen one, 'til I got my first CC.

No, on a 72 I don't even think it was a factory option. A PO installed it.

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Posted By: caricoa28
Date Posted: May-15-2015 at 3:07pm
So to go back to what GMacLaren was saying about the loop keeping water in the pump and primed when the boat is out of the water- Every time I took my boat out of the water I would start the engine to blow out the water from the exhaust manifolds. I was told that water sitting in there for long periods of time could be harmful. Was this good advice, or should I be leaving the water in there.

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Steve
Lodi , Ca


Posted By: GMacLaren
Date Posted: May-15-2015 at 3:38pm
I would hesitate to run the engine (and therefore the RWP) out of the water unless water was being supplied. The impeller in the RWP is certain to fail if run dry for even very short periods. In other words, it's better to keep water in the pump, so it is not run dry for even very short periods of time.
-=Grant=-

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Posted By: GMacLaren
Date Posted: May-15-2015 at 3:44pm
Or, maybe you'd prefer to run it dry:





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Posted By: TRBenj
Date Posted: May-15-2015 at 4:14pm
The quick start will not harm the impeller, it's still holding water. Save it for the quick start prior to your next outing though, water will preven corrosion (caused by air). It's only harmful if it will freeze, but blowing them out won't be enough to save you anyways.


Posted By: caricoa28
Date Posted: May-15-2015 at 6:14pm
Thank you so much for the info.. It looks like ill be keeping the water in the system from now on, I don't keep my boat outside so its never going to freeze, so no worries about that.. In fact, I think im going to go buy a new impeller this week just because even looking at Grants impeller in pieces like that makes me nervous! Thanks again guys

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Steve
Lodi , Ca


Posted By: Gary S
Date Posted: May-15-2015 at 6:15pm
You might blow the water out of the exhaust hoses but your not going to blow the cooling water out of the manifold and risers internal passages. At that point you'd be better off to raise the front of the boat to drain the pipes.

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Posted By: GMacLaren
Date Posted: May-15-2015 at 6:34pm
Originally posted by caricoa28 caricoa28 wrote:

Thank you so much for the info.. It looks like ill be keeping the water in the system from now on, I don't keep my boat outside so its never going to freeze, so no worries about that.. In fact, I think im going to go buy a new impeller this week just because even looking at Grants impeller in pieces like that makes me nervous! Thanks again guys


A new impeller is always a good idea. Cheap insurance. We recently toured the St. John's River in Florida. Apx 200 miles over a few days. The ONLY thing I did to prepare the '77 America Skier (purchased just for the trip, and now sold) was to rebuild the RWP. Those impeller photos are of an impeller out of a '73 Resorter in WI -- not my boat, but I was using it when the impeller failed, and I noticed a high temp reading . That's why I was towed home by a friend in his 'toon, and why I rebuilt the CC's pump:



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Posted By: 8122pbrainard
Date Posted: May-15-2015 at 9:43pm
Originally posted by caricoa28 caricoa28 wrote:

I was told that water sitting in there for long periods of time could be harmful.   

WOW!!! You had better run home and drain your toilet too!!!

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