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#1
06-13-2026, 11:25 AM
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Water pump leak
Well things were going too smoothly! 428 swap was going well. Filled up with antifreeze today. It started dripping out where the water pump meets the intake. My guess is the gaskets are just dried out. I saw no signs of anything before. I checked all the bolts and everything is tight.
I guess everything is coming off the front so I can fix this. Ugh. Not complicated but a pita. I just got everything on! lol I’m wondering if I should replace the water pump while I’m in there? I have no reason to believe there is a problem but… |
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#2
06-13-2026, 11:42 AM
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The round seal? hey are hard. I Silicone both sides, Loosen intake just so it can move a little. If Water Xover is separated form intake, but loosen that. Tighten all the other water pump bolts, then tighten the WP to Intake bolt. Then tighten intake back down
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Dan Pesonen  "If it ain't broke, modify somethin till it is" |
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#3
06-13-2026, 11:51 AM
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Now I’m wondering if taking off the intake is easier, or the more appropriate route?
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#4
06-13-2026, 03:07 PM
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Pull the intake. It will pull forward using the transfer bolt and seal the donut. The timing cover won't do that. agree on light coat of gray silicone on both sides of donut gasket.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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#5
06-13-2026, 03:09 PM
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I’m wondering if I should replace the water pump while I’m in there? I have no reason to believe there is a problem but…[/QUOTE]
Reseal and run it. I'd take the pump off by itself
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Chris D 69 GTO Liberty Blue/dark blue T400, 9" w 3.50s, 3905lbs 461, 850 Holley, T2, KRE 310s, Comp HR 236/242D .572/.594L, RA manifolds, 11.53@114, 1.55/60 The spare: 467, 850 Holley, T2, Edelbrock Dport 310cfm w RA manifolds, Howard HFT 245/251D .561/.594L, 11.59@ 114, 1.57/ 60' |
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#6
06-13-2026, 06:46 PM
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Agreed- if it isn’t leaking at timing cover/intake seal, why disturb that
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Will Rivera '69 Firebird, 400/461, 290 Eddy D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '69 LeMans Vert, XS 350, #47 heads, TH400, 10 Bolt 3.23 gears, work in progress ‘66 Lemans, 455, 310 KRE D-Ports, HR 236/245, TH400, GV OD, 12 bolt 3.73 gears - see it here: https://youtu.be/RP_s1wJKm_Y?si=K0NZxoTyaGcj8Dcb |
| The Following User Says Thank You to grivera For This Useful Post: | ||
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#7
06-16-2026, 02:50 PM
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Updated
Well I pulled the intake. Water crossover was super gooked. Not surprised it was Leaking. I cleaned it up, as well as the intake and heads. Will put it all back together tomorrow and try again!
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| The Following User Says Thank You to hgiv For This Useful Post: | ||
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#8
06-17-2026, 08:54 AM
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New donut rubber gasket, use right stuff each side of that gasket.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick. Best so far 9.95@135 mph. 1.39 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exhaust 950 Quickfuel. |
| The Following User Says Thank You to chuckies76ta For This Useful Post: | ||
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#9
06-17-2026, 10:51 AM
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JBP sells a thicker o-ring that makes sealing easier
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Will Rivera '69 Firebird, 400/461, 290 Eddy D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '69 LeMans Vert, XS 350, #47 heads, TH400, 10 Bolt 3.23 gears, work in progress ‘66 Lemans, 455, 310 KRE D-Ports, HR 236/245, TH400, GV OD, 12 bolt 3.73 gears - see it here: https://youtu.be/RP_s1wJKm_Y?si=K0NZxoTyaGcj8Dcb |
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