TTY or Hi tensile bolts on Ford Diesel engine
Thread Starter
Virgin
Joined: Jan 2011
Posts: 1
Likes: 0
From: Glasgow
TTY or Hi tensile bolts on Ford Diesel engine
I have a ford 1600D Diesel engine in my boat which I am totally rebuilding I am sure the engine is based on the Kent 5 bearing cross flow engine. I have got the block re-bored, new +30# pistons, new main and big end bearings, a new cylinder head (to replace the exiting cracked one) new water pump and all the gaskets. Big problem is that I cannot find new bolts for the main bearings, big ends and flywheel bolts and the manual warns of dire consequences of re-using the old bolts. The bolts are 3/8" UNF and 7/16" UNC and 7/16" UNF "Stretch to Yield" type.
Try as I might and even with the power of the internet, I have been unable to source a supplier and was wondering about using standard High Tensile bolts and setting them to their maximum torque with a dab of loctite to make sure they don’t rattle loose. Unfortunately, the maximum torque is in fact only the initial torque of the Stretch to Yield bolts which are then subjected to almost a further 90 degrees of angle tightening as shown below
The Big End bolts are tightened to a specific torque and then through two stages of angle tightening of 50 degrees and then further 25 degrees
The Main Bearing bolts are tightened in the same manner but only have a single angle set of 75 degrees
The Flywheel bolts is to a specific torque and then two angle sets of 40 + 40 degrees
Now here is the dilemma, do I reuse the existing bolts or use new non "Torque to Yield" bolts and slap on some loctite.
One point is that the engine in its car variant runs up to 54 hp at 4800 rpm but I will only be running at 25 hp @ 2000 rpm in my boat, (a fast tick over by you guys racing standards) but the engine has to be 100% reliable, there is no AA and getting the lifeboat out is a real "RED FACER" .
Can anyone help or suggest where I can get TTY bolts other than ARP.
Try as I might and even with the power of the internet, I have been unable to source a supplier and was wondering about using standard High Tensile bolts and setting them to their maximum torque with a dab of loctite to make sure they don’t rattle loose. Unfortunately, the maximum torque is in fact only the initial torque of the Stretch to Yield bolts which are then subjected to almost a further 90 degrees of angle tightening as shown below
The Big End bolts are tightened to a specific torque and then through two stages of angle tightening of 50 degrees and then further 25 degrees
The Main Bearing bolts are tightened in the same manner but only have a single angle set of 75 degrees
The Flywheel bolts is to a specific torque and then two angle sets of 40 + 40 degrees
Now here is the dilemma, do I reuse the existing bolts or use new non "Torque to Yield" bolts and slap on some loctite.
One point is that the engine in its car variant runs up to 54 hp at 4800 rpm but I will only be running at 25 hp @ 2000 rpm in my boat, (a fast tick over by you guys racing standards) but the engine has to be 100% reliable, there is no AA and getting the lifeboat out is a real "RED FACER" .
Can anyone help or suggest where I can get TTY bolts other than ARP.
PassionFord Post Whore!!
Joined: Aug 2003
Posts: 4,631
Likes: 1
From: Manchester.
I personally wouldn't re use the bolts. They will now be at plastic deformation and scrap. Torque them again and chances are they'll just snap.
Can't help you on where to get the bolts, possibly get some made up but I imagine that will be ££££
Can't help you on where to get the bolts, possibly get some made up but I imagine that will be ££££
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