Quick question proberbly a long answer involving more questions ;-)

Scenario: I have a 2002 TD5 110 Double Cab. THe exhaust manifold requires
ten bolts one above and below each feed. At the end closest to the bulkhead
one of the nut/bolt combo's seems to have rotted away near the engine block
and the other nut had dropped off and was sitting in between the maifold
feeds. When I put it back on that one sheared really easily too so I assume
was rotton. I was only having a quick look as the exhaust is blowing and I
was going to have-a-go at the weekend. Had to remove loads of plastic
boxing and other stuff first to see where and why it was blowing. so
anyways......

The Question: because both have sheared and I dont want to take the maifold
off until the weekend to have a proper look and also becasue I have never
done this end of an exhaust before. Are those bolt which have rotted
threaded? I assume they are but assumption gets me nowhere sometimes.

Thanks in advance.....

regards,

Mark