Seized engine

[Rubythursday]

I have come accross Ford line boring blocks indeed my V4 had oversize main bearings but not come accross it on a Rover. You really need to use a micrometer to check the diameter, it is quite difficult to get the 'feel' with vernier calipers. The shells should be marked 010 US if they are undersize.

 

[ghce]

Ditto, had the same with my V6 ford Zephyr motor, line bored out 10 thou over, wish I had noticed before I reinstalled and ran the engine

Graeme

 

[Phil Robson]

Interesting comments guys - thanks for your help.

This is the piston measurement: (manual says std is 3.375 in)



& the big end journal: (manual says std is 2.00 in)



Here's the big end shell just removed:



& this is the main bearing shell as removed:



I suppose I'd better measure the main crank journal diameter now..

 

[Phil Robson]

I suppose I'd better measure the main crank journal diameter now..

It looks like it's 2.50 in, ie: standard again! :roll:

..actually reads 2.495 in....what does this mean :?

 

[keanej]

I find my local engineering shop really helpful when it comes to classic engines they always provide free advice and tend to charge less than the list price, so I would take the crank down to your local shop and explain your dilemma and ask them to complete the measurements for you.

Assuming your measurements are correct, and they certainly look right - perhaps the shells are oversize from another application ?

As for the piston should they be measured at the top ?

 

[vaultsman]

Hi Phil,

We're at the same stage here on our 4-pots!

For these measurements you really need a micrometer rather than a caliper.

The knife edge caliper faces make it more difficult to get the instrument square for accurate measurements, and it's easy to get oversize readings. As necpwa says, with a micrometer, you can get a "feel" on the diameter. 010 marking on the shells normally denotes they are 10 thou undersizes for the first crank regrind. and it's possible your journals are indeed 10 thou undersize (1.990" and 2.490") and the shells are correct for them.

From the manual, the piston-to-bore clearance (at bottom of skirt and at right angles to the gudgeon pin) is .0015" to .0020" so your reading there doesn't look too bad at all.

If you can't easily get a local engineering shop to check the crank journals for you, and you can't get hold of a mic, I can post mine up to you?

 

[ghce]

I would not be using a vernier for these types of measument period, this is where a micrometer must be used.
For your piston measurement are you trying to determine oversize or just skirt wear?

Graeme

 

[Phil Robson]

For your piston measurement are you trying to determine oversize or just skirt wear?
Graeme

I'm trying to find out how the engine was rebuilt by Rover all those years ago, so I can get the right parts to rebuild it again.

Looking back to the engine plate, the serial no. is K0222\00\10. It looks from my measurements that this means 00 'oversize' (standard) pistons & +10 bearing shells.

I'll get a micrometer (thank you for your kind offer Stan) & do the job properly. I've never stripped an engine before, so I'm learning as I go along!