15 replies to this topic

[Coolingthunder]

Hi all,

I am working on fixing an old engine a buddy of mine sold me.

Of course, the identifying plate went missing, I was assuming it was a 998cc pre A+.

However today I noticed that the cylinder head is a 12a456, which apparently was fitted to the 850!

Is there a way to see the difference between an 850 and a 998 only looking at the block?

[wile e coyote]

Looking - not with total certainty measuring yes - as standard  850 bore 2.48" (62.94 mm) and 998 2.54" (64.58 mm)  - if its an A+ (webbing on the block) not going to be an 850....

 

998 bore size same as an 1100 (stroke different), 1275 is 2.78" (70.66 mm)

 

 

The 12A1456 was the "vanilla" 850 & 998 head up to 1980....

[whistler]

If the dipstick goes directly into the block then it's likely an 850. Most other engines used a steel or plastic tube in the dipstick hole.

[nicklouse]

Heads can be changed. A+ engines did not have a dipstick tube. 850s did not. A series did use a tube.

There will be casting numbers on the block that will help.

Or post up pictures.

[Spider]

Is there a way to see the difference between an 850 and a 998 only looking at the block?

 

On the Fuel Pump side of the block there'll be some numbers cast in to the block. If you can see what they are, we might better be able to ID it.

[Coolingthunder]

Measured the bore and it's about 64.58 (my tool says 64.28 but it cost me all of 5 euros so that's probably why)

Numbers are WFM 1026,the rest is really hard to read.

[GraemeC]

I'm pretty sure WFM1026 is an A+ casting

 

Post some photos

[Nial]

Am I right in thinking that 850 blocks didn't have the removeable covers that allow you to get at the cam followers on the back of the block?

 

Possibly not.

[wile e coyote]

Measured the bore and it's about 64.58 (my tool says 64.28 but it cost me all of 5 euros so that's probably why)

Numbers are WFM 1026,the rest is really hard to read.

Taking into account the "carbon rim" at the top of the bore in all likelihood a 998 then...

[cal844]

A wfm1026 is an a+ block

[Coolingthunder]

Sorry for late reply, but the clutch is a pre-verto clutch.


Could that still make it an A+ block?

My phone camera is not working at the moment, will post up some pics soon.

Edited by Coolingthunder, 17 June 2020 - 10:40 PM.

[GraemeC]

Flywheel/clutch type has nothing to do with the block.

WFM1026 is an A+ block.

[nicklouse]

Also note the heads on the 850 and 998 are the same casting.

[Coolingthunder]

Here are some pics of he block.

Attached Files

•  20200618_164235.jpg   51.49K   2 downloads
•  20200618_164240.jpg   72.01K   2 downloads

[Spider]

OK thanks for the photos.

 

It is a 998 Block and almost certainly a 998 at that.

 

 

Sorry for late reply, but the clutch is a pre-verto clutch.


Could that still make it an A+ block?

 

 

The A+ Engine Blocks came on stream during the 2nd half of 1979 and the Verto Clutch wasn't fitted until about 1983 or 1984. The early A+ Engines were fitted with Pre-verto Clutches.