Hi,
Just reinstalling the engine and I notice a bolt between front engine mount and downpipe, just above the sump. I cannot work out its purpose.
 
cheers,
Nigel
 

I cant be sure as I havent worked on a stock motor for a while but it looks like its the bolt point for one of the turbo/dump pipe stay brackets. 

Thanks Stuka but no, the cat stays are accounted for.
I can't see any parts, waiting to go back on, that go in that region.
Not sure if I need it at all, but I've seen oil come out of other engines when a bolt has been omitted.
  thanks for the response,
Nigel
 

Bingo, it is for the Stiffener Plate that braces the transmission to the block below the starter motor.
 cheers,

My son says I should delete the thread, but we can't find a Delete function anywhere.

TwoDogs
Bingo, it is for the Stiffener Plate that braces the transmission to the block below the starter motor.
 cheers,

Do you have the stiffener plate?
Not sure about turbo models, but I believe it has an important function on the 3SGE motor with the S54 trans.

TwoDogs
My son says I should delete the thread, but we can't find a Delete function anywhere.

Don't delete 'please help' threads! Especially ones with answers (even ones without answers - they may get answered eventually)
 
That way when some other punter has the same drama, they search, find the question and hopefully the answer. Caring and sharing, not finding out and deleting. 

Reddtarga
 
Do you have the stiffener plate?
Not sure about turbo models, but I believe it has an important function on the 3SGE motor with the S54 trans.

 Yes we have the stiffener. It was lying on the floor, and my 17yr old didn't recognise it, he has done all the spanner work. So I went to the online BGB to scroll through diagrams and was quite lucky. The perspective in BGB diagram makes the piece almost unrecognisable, but there it was and made sense. So I threw it to my son who  was under the car and he confirmed it.
In this instance, it's a 3sgte - E153 box.