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I am switching out a rear sump oil pan to front sump on a 4.6 ford engine to install in a 61 Sunliner. Part of this swap of course is also to remove the rear sump pick up tube and replace with a front sump pick up tube. In order to do that however, two crankshaft main cap bolts need to also be relocated. One of the bolts has a spacer on it for the pick up tube to attach to.
See attached picture: The cap bolt with the spacer in the pic is currently in the correct location for the front sump pick up tube. It was previously located just left of the dip stick.
Here is my question: Can anyone confirm these are TTY bolts. If they are, is it safe to reuse the two that I removed and relocated? I think they are sold in complete sets only, so I don't really want to replace all of them if I don't have to. I didn't touch any of the other bolts and I am not racing the engine. I was thinking I may need to torque those two down slightly more to account for stretch and I will be OK? Help anyone?
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Sorry, I cannot tell you if those TTY bolts. However, from what I know you cannot reuse TTY fasteners. Once and done is what I believe to be the case. Does Google tell you anything?
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There are lots of varied opinions about this. Most of the information suggests they cannot be reused. I have read other forms where guys have reused them with no problems. I personally know one guy that reused all TTY bolts on an engine head after switching out the head gasket and had no issues. If I would have removed all of the bolts, I would not reuse them, I would replace all with new. However, i only removed two bolts so not sure what to do. From what I understand, the danger of reusing TTY bolts is they will break when torqued down a second time. Mine didn't and I torqued them slightly further to account for any stretch.
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I think the key thing with TTY bolts is that you don't just torque them down and leave them, like regular bolts. TTY bolts are torqued to spec and then turned an additional, specific rotation to achieve the desired clamping force. They may not snap when being re-troqued, but they are also not working as intended. They are probably more likely to snap when they are properly installed to their designed stretch load as to achieve the desired claming force they would propbably have to be turned even farther than the original over-torque spec.
I'd be concerned about trying to save a few dollars on the bottom end of my engine. New bolts are probably cheaper than having the bottom end come apart when running. IDK
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Thanks for the reply. As a follow up, I decided to reuse the bolts. I just couldn't see how two bolts that size would fail under normal driving conditions from being reused. After a few sleepless nights, I contacted a friend who has been building engines and racing cars for over 35 years about what to do. He said he would reuse them, no problem, so that is what I did. Put my trust in experience
Keep you posted!
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70XL wrote:
I think the key thing with TTY bolts is that you don't just torque them down and leave them, like regular bolts. TTY bolts are torqued to spec and then turned an additional, specific rotation to achieve the desired clamping force. They may not snap when being re-troqued, but they are also not working as intended. They are probably more likely to snap when they are properly installed to their designed stretch load as to achieve the desired claming force they would propbably have to be turned even farther than the original over-torque spec.
I'd be concerned about trying to save a few dollars on the bottom end of my engine. New bolts are probably cheaper than having the bottom end come apart when running. IDK
This is the truth.
Z.
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