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Joined: Sep 2003
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New CEG\'er
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I recently (1500 miles ago) changed my water pump as a part of preventative maintenance. I put on a pump with a cast iron impeller, used gasket sealent(on both sides) and reused all 8 bolts. Then I found out that 3 of the 8 bolts (the bolts that hold the pump to the head) are not supposed to be reused because the are "torque-to-yield" bolts. Do I have a problem here? Also, I didn't use a torque wrench when installing the new pump, just installed them to what I thought was reasonable. No leaks (yet).
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Joined: Jul 2002
Posts: 4,714
Scourge of the Master Debaters
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Scourge of the Master Debaters
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Originally posted by manofmystique:
Then I found out that 3 of the 8 bolts (the bolts that hold the pump to the head) are not supposed to be reused because the are "torque-to-yield" bolts.
Where did you read/see/hear this? The Ford service manual makes no mention of any TTY bolts on the water pump. In fact, it specifically mentions when TTY bolts are used on components, like on the crankshaft pulley.
FYI the torque to be used on all 8 bolts is 18Nm.
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'98 "Sport" Pacific Green
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Joined: Mar 2001
Posts: 52
CEG\'er
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CEG\'er
Joined: Mar 2001
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In Haynes manual, it suggests not reusing the bolts because it it torque-to-yield. I had questions about that myself, when I wanted to replace my waterpump. From the previous posts, I assume people had no problems reusing them.
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Joined: May 2000
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Webmaster
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Webmaster
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I had no problems reusing mine. That was in Aug 2000.
-Lance
Lance Kinley
CEG Webmaster
95 SE, "Cassandra"
10 years!
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Joined: Jul 2002
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Scourge of the Master Debaters
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Scourge of the Master Debaters
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Crap, my brother has my Haynes manual so I can't check it. Honestly, though, I'd trust my Ford manual from todras over the Haynes manual anyday. I like my Haynes manual, don't get me wrong, but I've heard of a few things that they got wrong.
Beer is my Gatorade.
Hooray Beer.
'98 "Sport" Pacific Green
'98 E0 SVT Silver Frost
Pictures
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Joined: Nov 2002
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Veteran CEG\'er
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Veteran CEG\'er
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I recall reading in the 1996 Ford service manual (I have it on CD) that the water pump housing to engine blcok bolts on the Duratec are TTY.
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Joined: Dec 2002
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Hard-core CEG'er
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Hard-core CEG'er
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My manual says they are TTY bolts. But I reused them and have had no probs at all...
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Joined: Sep 2003
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New CEG\'er
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OP
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I got the "do not reuse bolts" info from Chiltons. I bought the manual after the pump replacement.
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Joined: Aug 2002
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Hard-core CEG\'er
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Hard-core CEG\'er
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I don't see any mention of the water pump bolts being TTY in the Haynes manual  6k miles since I reused mine, no problems *knock on wood*.
Chris G.
~ 98 Mystique LS ATX
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Joined: Jun 2001
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Hard-core CEG'er
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The idea behind TTY is that the fastener is stretched to the elastic limit of the metal. (the elastic limit is the ammount something can be stretched and still return to its original dimensions when the force is removed) The problem with reusing TTY bolts is that although they return to their original dimensions when removed the metal is stressed and tightening them to TTY again will possibly result in distortion and/or weakening of the fastener.
For their purpose the waterpump bolts will liikely never have a problem if they are reused. But if you were to reuse a TTY bolt that is used for a high load application like a connecting rod cap, main bearing cap or cylinder head then you might have a problem.
Last edited by JSmith; 12/20/03 11:57 PM.
I feel sorry for the people who don't drink. When they wake up in the morning, thats the best they're going to feel all day - former President Lyndon B. Johnson
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