Re: Rubber Fitting for Small Block Water Pump
[Re: MuuMuu101]
#2611425
01/24/19 03:19 AM
01/24/19 03:19 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I think the black cap on the pump heater hose nipple split way before the rad cap reached its psi limit so it did not let it puke into the overflow. Not sure what to recommend for another one but I used some white rubber chair leg protectors from a hardware store & no issue! (not recommended tho!) You can get a "tank valve" from O'reillys for less than $3 (1/8 NPT male threads) & screw it into the coolant temp sensor port in the top rear of the block & pump it up to 5lbs or so for a start & see what you see (I wouldn't go much over 10 if even that). You'll see an issue way before that. with the system full of coolant (not compressable) & very little dead air space it will reach that very quickly so put your air chuck on it for a split second at a time then check it with your tire gauge.
live every 24 hour block of time like it's your last day on earth
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Re: Rubber Fitting for Small Block Water Pump
[Re: MuuMuu101]
#2611480
01/24/19 11:07 AM
01/24/19 11:07 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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this is why it is not a good idea to block the by-pass hose. it causes cavitation/pressure at high rpms with thermostat closed.
the heater hose nipple is ok to plug off. just as you have.
you can get the new block off caps at local AP store. when asking = heater core block off caps. most times in the HELP section.
I fill the WP nipple with a good rtv and let cure 24 hrs, then cap it with one of the rubber caps. this way I can always go back to heater lines.
I had a cap blow at 4800 rpm in 2md gear. made a loud bang (cap/water hitting hood?) engine falls on its face and dies. thought I blew engine.
sucked water flooding it and sucking my open filter flat to the base killing it.
yea every couple yrs those need replaced for sure. why I started filling the port on my junk when not used.
I add a spring in lower rad hose to keep them from sucking flat at higher rpm.
check/watch those hose clamps cutting into the rubber as they get old and shrink.
good idea to change both = less than 10$ not counting coolant.
and that is a very nice clean looking engine sir! can of engine brite to wash it down on the list?
do you have the 6 vane or 8 vane pump on there?
6 vane for a/c and 8 vane for non a/c
are those under drive pulleys?
FYI. pump rpm
6 vane on a/c as it uses a smaller/faster pulley to pump x amount at idle.
8 vane on non a/c as it uses a bigger/slower pulley to pump same x amount at idle.
running 8 vane with a/c pulleys can cause pump to cavitate at high rpms for extended run times.
looks like you have a stock non a/c wp pulley size.
I like to run a 8 vane non a/c pulley with a HD max cooling thermo-clutch 7 blade fan on my hot rod.
Last edited by scratchnfotraction; 01/24/19 11:08 AM.
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Re: Rubber Fitting for Small Block Water Pump
[Re: MuuMuu101]
#2611485
01/24/19 11:16 AM
01/24/19 11:16 AM
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Joined: Mar 2005
Posts: 1,406 New Jersey, USA
yella71
pro stock
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pro stock
Joined: Mar 2005
Posts: 1,406
New Jersey, USA
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Yeah lose that rubber cap, I had one of those on my 340 and it lasted 1 day. it looks real nice and clean but they suck. tap pipe threads into the nipple and put in a pipe plug. if you want heat just unscrew the plug and connect the hose. is it worth getting stuck or losing a Head for that?
71 challenger convertable, 64 sport fury 383 ci with factory air
99 sebring convertable
89 CTD pup
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Re: Rubber Fitting for Small Block Water Pump
[Re: yella71]
#2611498
01/24/19 12:04 PM
01/24/19 12:04 PM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Yeah lose that rubber cap, I had one of those on my 340 and it lasted 1 day. it looks real nice and clean but they suck. tap pipe threads into the nipple and put in a pipe plug. if you want heat just unscrew the plug and connect the hose. is it worth getting stuck or losing a Head for that? This is what I've done in the past before going to an electric pump.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Rubber Fitting for Small Block Water Pump
[Re: yella71]
#2611537
01/24/19 01:20 PM
01/24/19 01:20 PM
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Joined: Dec 2010
Posts: 12,375 SoCal
MuuMuu101
OP
I got lucky at Woodward!
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OP
I got lucky at Woodward!
Joined: Dec 2010
Posts: 12,375
SoCal
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Yeah lose that rubber cap, I had one of those on my 340 and it lasted 1 day. it looks real nice and clean but they suck. tap pipe threads into the nipple and put in a pipe plug. if you want heat just unscrew the plug and connect the hose. is it worth getting stuck or losing a Head for that? Do you happen to know what thread? The only pipe thread tap I have at work is 1/8-27 NPT.
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Re: Rubber Fitting for Small Block Water Pump
[Re: Joesixpack]
#2611557
01/24/19 02:22 PM
01/24/19 02:22 PM
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Joined: Jun 2005
Posts: 5,102 Western Md.
skicker
"The Champ"
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"The Champ"
Joined: Jun 2005
Posts: 5,102
Western Md.
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A closed end 1/2 lug nut for aluminum wheels fits perfect inside a short piece of heater hose...looks a little funny but doesn't fail... I tapped the ones on the Duster...maybe 1/4" NPT? definitely check to see if you also need to drill it 1st with a bit for the correct thread...Don't force the tap as the aluminum is thin...Maybe a little grease to capture any shavings... If I had to do over again I would have cut them off closer to the housing and then tapped them...More like the way the cast water pump fittings install in the bottom pic...
...FAFO...
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Re: Rubber Fitting for Small Block Water Pump
[Re: skicker]
#2611568
01/24/19 02:46 PM
01/24/19 02:46 PM
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Joined: Dec 2010
Posts: 12,375 SoCal
MuuMuu101
OP
I got lucky at Woodward!
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OP
I got lucky at Woodward!
Joined: Dec 2010
Posts: 12,375
SoCal
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A closed end 1/2 lug nut for aluminum wheels fits perfect inside a short piece of heater hose...looks a little funny but doesn't fail... I tapped the ones on the Duster...maybe 1/4" NPT? definitely check to see if you also need to drill it 1st with a bit for the correct thread...Don't force the tap as the aluminum is thin...Maybe a little grease to capture any shavings... If I had to do over again I would have cut them off closer to the housing and then tapped them...More like the way the cast water pump fittings install in the bottom pic... Someone had recommended a 3/8 NPT tap. I like the grease idea, I really don't want to take this pump off.
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Re: Rubber Fitting for Small Block Water Pump
[Re: MuuMuu101]
#2611857
01/24/19 11:54 PM
01/24/19 11:54 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Got a dial caliper?
The following chart shows the hole size needed for various tapes. Find the pipe tap that fits.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Rubber Fitting for Small Block Water Pump
[Re: Supercuda]
#2611880
01/25/19 01:07 AM
01/25/19 01:07 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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for it to be aesthetically pleasing I would as said cut the nipple off & NPT tap it for a plug (I'm assuming you ain't never gonna use the heater again with this engine/pump) like in the pic & first stuff a piece of rag in there to catch the shavings. If the (final) appearance ain't objectionable as said the piece of heater hose with a plug/2 clamps would be the easiest/fastest.
live every 24 hour block of time like it's your last day on earth
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Re: Rubber Fitting for Small Block Water Pump
[Re: MuuMuu101]
#2612057
01/25/19 02:23 PM
01/25/19 02:23 PM
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Joined: Jan 2008
Posts: 3,886 Lost and Spaced
bboogieart
master
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master
Joined: Jan 2008
Posts: 3,886
Lost and Spaced
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Not sure what you used. Looks kinda like it was made for the purpose intended. There is definitely cracking visible. It kind of looks like the clamp may have been to tight. I usually just use regular heater hose and a pipe plug. Doesn't look as nice. Never had them leak.
I have mechanical Aptitude. I can screw up anything.
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