Crankshaft identification
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What identifiers are there for a genuine twin cam 6 bolt crank? I've seen some with a cast 3020E number, plus are the main journals and crank pins for std/undersize as per the workshop manual specific Lotus or generic for Ford? Anything else?
Thanks
Malcolm
Thanks
Malcolm
1966 Elan S3 Coupe
1994 Caterham 7
1994 Caterham 7
- englishmaninwales
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Okay, 136 views and no answers, so I guess it's a bit tricky! I'm hoping to collect the bits to convert my 4 bolt rope seal crank to a 6 bolt lip seal. (And I've missed 2 later type sumps for sale now )
Malcolm
Malcolm
1966 Elan S3 Coupe
1994 Caterham 7
1994 Caterham 7
- englishmaninwales
- Fourth Gear
- Posts: 759
- Joined: 26 Jul 2013
As far as I know Ford only made the 1500 six bolt crank for Lotus, previously Lotus had used the 1500 four bolt crank.
When the six bolt came out it was for the 11/13/1600 Xflow engine but because Lotus was still using the 1500 block Ford carried on making it as the Lotus 1558cc engine was still used in the MK2 Cortina Lotus (designation 3020E) so any six bolt 1500 crank with 3020E would be a Lotus crank.
When the six bolt came out it was for the 11/13/1600 Xflow engine but because Lotus was still using the 1500 block Ford carried on making it as the Lotus 1558cc engine was still used in the MK2 Cortina Lotus (designation 3020E) so any six bolt 1500 crank with 3020E would be a Lotus crank.
Brian
64 S2 Roadster
72 Sprint FHC
64 S2 Roadster
72 Sprint FHC
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types26/36 - Coveted Fifth Gear
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Ron,
Have you any info which Cortina's had a 1500 six bolt crank? the Mk1's had the 1500 four bolt pre Xflow and the Mk2's had a Xflow engine a with six bolt crank although I do believe the first couple of Mk2's were fitted with the MK1 1500 PreXflow engine.
Have you any info which Cortina's had a 1500 six bolt crank? the Mk1's had the 1500 four bolt pre Xflow and the Mk2's had a Xflow engine a with six bolt crank although I do believe the first couple of Mk2's were fitted with the MK1 1500 PreXflow engine.
Brian
64 S2 Roadster
72 Sprint FHC
64 S2 Roadster
72 Sprint FHC
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types26/36 - Coveted Fifth Gear
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Hi Brian,
I've got a 6 bolt crank in my 1967 mk2 cortina 1500 (2731E block) which is definitely not a lotus crank as I've had it out not so long ago - I can't remember exactly but I believe the crank is also marked 2731E. It has much smaller counterweights on it to the genuine 3020E lotus crank.
EDIT : the 2731E block and crank was only in production for 8 months or so so are incredibly hard to find as singles never mind as a pair!
I've got a 6 bolt crank in my 1967 mk2 cortina 1500 (2731E block) which is definitely not a lotus crank as I've had it out not so long ago - I can't remember exactly but I believe the crank is also marked 2731E. It has much smaller counterweights on it to the genuine 3020E lotus crank.
EDIT : the 2731E block and crank was only in production for 8 months or so so are incredibly hard to find as singles never mind as a pair!
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promotor - Fourth Gear
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Hi Al,
Thats interesting as I thought the 2731 was a Lotus four bolt engine, well at least this one is as it has the "L" cast in between the engine mount and as can be seen it has the Lotus front cover and four bolt flywheel
.......another day and another anomaly
PS. I still need to send you that bitsa diff if thats ok.
Thats interesting as I thought the 2731 was a Lotus four bolt engine, well at least this one is as it has the "L" cast in between the engine mount and as can be seen it has the Lotus front cover and four bolt flywheel
.......another day and another anomaly
PS. I still need to send you that bitsa diff if thats ok.
Brian
64 S2 Roadster
72 Sprint FHC
64 S2 Roadster
72 Sprint FHC
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types26/36 - Coveted Fifth Gear
- Posts: 3873
- Joined: 11 Sep 2003
Brian et al,
I have had a look in my Ford parts books for mk1 and mk2 cortinas including Lotus cortinas -
the standard 1500 crank is 2731e 6303;
Lotus cranks are 125e 6303 for the 4 bolt crank/ropeseal and 3020e 6303 for the 6 bolt with lip seal;
The 125e 6303 crank is only mentioned in the mk1 lotus book;
The 2731e block is only mentioned in the mk2 book and doesn't mention Lotus;
120e Lotus blocks (aswell as standard 1500 120e blocks) are mentioned only in the mk1 book;
3020e blocks are mentioned in both the mk1 and mk2 books.
I expect the 2731e was the latest design of the Lotus blocks AT THAT TIME and those that we rarely see with 2731e and the "L" between the engine mounts is either a Lotus block that someone forgot to grind the number off (who knows if all the later blocks with the numbers ground off DIDN'T have 2731e on it prior to foundry workers getting there?) or from the "seconds/wrongly machined/cast line".
If the block has Lotus numbers on the engine mount then it must have come in a Lotus engined car from the factory, if not (engine numbers aren't in "Lotus" style but in a Ford style) then maybe it was used for something else such as a standard cortina. No reason that the other lotus parts couldn't be added by an owner at a later date.
HTH?
And yes - you can send me the bitsa diff whenever you're ready! Have you got tired of turning the other diff every week or so?
P.S sorry to the O.P. for the thread hijack! Hopefully we'll be back on track!
I have had a look in my Ford parts books for mk1 and mk2 cortinas including Lotus cortinas -
the standard 1500 crank is 2731e 6303;
Lotus cranks are 125e 6303 for the 4 bolt crank/ropeseal and 3020e 6303 for the 6 bolt with lip seal;
The 125e 6303 crank is only mentioned in the mk1 lotus book;
The 2731e block is only mentioned in the mk2 book and doesn't mention Lotus;
120e Lotus blocks (aswell as standard 1500 120e blocks) are mentioned only in the mk1 book;
3020e blocks are mentioned in both the mk1 and mk2 books.
I expect the 2731e was the latest design of the Lotus blocks AT THAT TIME and those that we rarely see with 2731e and the "L" between the engine mounts is either a Lotus block that someone forgot to grind the number off (who knows if all the later blocks with the numbers ground off DIDN'T have 2731e on it prior to foundry workers getting there?) or from the "seconds/wrongly machined/cast line".
If the block has Lotus numbers on the engine mount then it must have come in a Lotus engined car from the factory, if not (engine numbers aren't in "Lotus" style but in a Ford style) then maybe it was used for something else such as a standard cortina. No reason that the other lotus parts couldn't be added by an owner at a later date.
HTH?
And yes - you can send me the bitsa diff whenever you're ready! Have you got tired of turning the other diff every week or so?
P.S sorry to the O.P. for the thread hijack! Hopefully we'll be back on track!
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promotor - Fourth Gear
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Excellent, that's very helpful.
Malcolm
Malcolm
1966 Elan S3 Coupe
1994 Caterham 7
1994 Caterham 7
- englishmaninwales
- Fourth Gear
- Posts: 759
- Joined: 26 Jul 2013
I took a look at the 4 bolt crank that came out of my 66 Elan and it differs in 1 digit - 125E 6303, but with the same DO4. This number fits with previous posts above, so presumably there were 125E 6302 and 6303?
(It is purely academic now for me as I have up graded to a 6 bolt crank, absolute bliss with no rear crank oil leak).
Malcolm
(It is purely academic now for me as I have up graded to a 6 bolt crank, absolute bliss with no rear crank oil leak).
Malcolm
1966 Elan S3 Coupe
1994 Caterham 7
1994 Caterham 7
- englishmaninwales
- Fourth Gear
- Posts: 759
- Joined: 26 Jul 2013
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