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Engine number 46A
Posted: Mon Jul 24, 2017 4:28 pm
by Alberialti
Hi folks, I've got a Westie Seight with an engine number 46A00161A. Any ideas what it came from ? I've looked at loads of lists and can't find any reference to the 46A series.
Posted: Mon Jul 24, 2017 7:50 pm
by Rossco
Most likely a replacement block which is why it's not the usual number.
PS, welcome to the madhouse
Posted: Mon Jul 24, 2017 9:36 pm
by Alberialti
Thanks Rossco, do you know of any way of tracing that ? The log book has it down as a 3.9, but the seller thought it might be a 4.6 ( though he didn't advertise it as that!). How can I find out ( without dismantling it !😎)
Thanks again. A
Posted: Tue Jul 25, 2017 12:50 pm
by Rossco
Hi
If it's a 4.6 block it will have cross bolts holding the main bearing caps in place. Having said that so does the 4.0 and the intermediate 3.9
Unless someone knows different I'm not aware of an external difference between the 4.0 and 4.6 blocks.
For certainty you could drop the sump off, if its a 4.6 the crank will have 4.6 stamped into it.
Posted: Tue Jul 25, 2017 1:20 pm
by Alberialti
Thanks again Rossco. Just done an oil change so don't fancy starting again so I can drop the sump 🤔 I've not really got the time or the ability to get too far into the depths of the engine, although I would have done when younger. (I don't bend in the middle as well as I used to ☹️). Guess l'll just have to keep looking at numbers for now.
Regards. A
Posted: Tue Jul 25, 2017 5:14 pm
by ChrisJC
The 4.0 and 4.6 blocks are indeed the same.
Chris.
Posted: Tue Jul 25, 2017 5:29 pm
by Alberialti
Thanks Chris. I had somehow hoped the prefix '46' might have meant it was a 4.6 but I guess that would be too simple for BL. The registration of my car is '93 but that's just the Sierra donor. I think the car was put together in '03 but that doesn't give an age to the engine.
The conundrum continues.
Thanks again, A