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1970 390 water pump bolt leaks |
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DHACKING 
AMC Apprentice 
Joined: Oct/06/2014 Location: DALLAS FT WORTH Status: Offline Points: 184 |
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 Topic: 1970 390 water pump bolt leaksPosted: Apr/16/2018 at 7:02pm |
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iv put a water pump on this car 3 times..
first time was given the wrong pump 2nd time water pump was defective and leaked profusely out the weep hole 3rd time did pressure test for 12 hours and had no leaks at 14psi drove car 50 miles and pump starts leaking from around the large bolts that go through the water pump and timing cover tried retorque the bolts it stopped for a while and now started again does anyone know if there is any certain precautions taken when installing pumps on these engines. about to go out of my mind....3 times and this is a very clean engine bay takes a lot of time to reassemble when trying to keep everything painted nice. any info is appreciated....... thanx..... nightmare raymon..... |
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RAYMON H
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304-dude
AMC Addicted 
Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: Apr/16/2018 at 7:33pm |
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I had a small hole at the top of my timing cover. Right at the water port about midway from block to pump. Lucky me, as it was easy to spot.
Probably from running old anti freeze for so long before I bought the car from the original owner. That hole could have gone anywhere around the water port on the timing cover. I bet you may have a crack or whole that is causing it to leak from your bolt hole. The only way to verify is take the cover off an inspect the port passage. I would say fill the bolt hole with lots of RTV, but your only masking the leak, which may flow behind the cover and into the pan. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Apr/16/2018 at 9:20pm |
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There were some pretty dang gone thick washers in places on the few AMC V8's I worked on.
imho the large Water Pump Bolts -MAY- bottom in the block BEFORE clamping on the Water Pump. One way is thread them in by hand with the Pump off and measure under the bolt heads and compare to the water pump casting thickness, which there are variations of the Water Pump Boss Heights... The Intake Manifold Mounting Bolts is another place this can potentially happen... That is Bolt bottoms out in blind tapped hole BEFORE actually creating sufficient clamping force...
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1970390amx
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Joined: Jul/11/2008 Location: colorado Status: Offline Points: 3314 |
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Posted: Apr/16/2018 at 9:32pm |
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I think the long 3/8 bolts go into holes that are open to the water jacket, I would use thread sealer on them. Multiple torquing of the bolts can crush the gaskets so they will not seal. I would only use felpro gaskets, lots of gaskets supplied with water pumps are junk.
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1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box |
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1948kaiser
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Joined: Jan/25/2015 Location: south west flor Status: Offline Points: 832 |
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Posted: Apr/17/2018 at 2:35pm |
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the long bolts have two different lengths based on which hole they go in. could have mixed them up and got them in the wrong hole and bottomed out.
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