i have an early prefix 186, (186A).
in theory this should have a steel crank, i have this engine out of the car and on an engine stand, how do i tell if it still has the steel crank? is the a part number or casting mark to look for?
186 steel crank id
Started by
red6
, Apr 15 2007 09:38 AM
12 replies to this topic
#1
red6
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Posted 15 April 2007 - 09:38 AM
#2
limo
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Posted 15 April 2007 - 09:26 PM
I was of the belief the steel crank was only in 149 and 179, 186 was cast
they are the same crank and interchangable,
I thought the part number on crank ended in 777 for steel but don't quote me
they are the same crank and interchangable,
I thought the part number on crank ended in 777 for steel but don't quote me
#3
View GaragePosted 15 April 2007 - 09:36 PM
according to LC parts manual 186 crank out of Xu1 is part no7434178
hope this helps
I will check my stel cranks tomorrow and let you know
peter
hope this helps
I will check my stel cranks tomorrow and let you know
peter
#4
red6
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Posted 16 April 2007 - 09:07 PM
from what i gathered early prefix 186's along with 186s had the steel crank
#5
Dr Terry
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Posted 16 April 2007 - 10:22 PM
Hi Guys.
ALL Holden 6 cyl cranks (149, 161, 179 & 186) were forged steel up to April 1967 (mid HR). After that only 186 X2, 186 S and LC XU-1 got the forgings all other 6 cranks were nodular cast iron.
Dr Terry.
ALL Holden 6 cyl cranks (149, 161, 179 & 186) were forged steel up to April 1967 (mid HR). After that only 186 X2, 186 S and LC XU-1 got the forgings all other 6 cranks were nodular cast iron.
Dr Terry.
#6
red6
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Posted 17 April 2007 - 08:10 PM
i was aware of this, mine is a hr block. but the engine has been rebuilt at some stage so i need to know how to id the crank to see if it still a steel one or has been replaced with an normal one
#7
red6
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Posted 09 May 2007 - 07:52 PM
so anyone have any idea of how to tell if its a steel one or not? mine is pre mid hr block so in theory it should be steel but its been rebuilt, i want to know if its worth putting on ebay as a 186s/X2/XU-1 type crank so i can save some $$$'s for my 202 rebuild
#8
_SableMet7/73_
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Posted 12 May 2007 - 10:16 PM
This works for chevs hope it helps.
Look at the front crank throw between the 1st main to
the 1st rod journal (the unmachined bit) if theres a
thin slightly raised line down the length of the throw
then its cast(casting mould parting line)
Forged cranks have a wide forging mark, about 8/10mm
cheers jono
Look at the front crank throw between the 1st main to
the 1st rod journal (the unmachined bit) if theres a
thin slightly raised line down the length of the throw
then its cast(casting mould parting line)
Forged cranks have a wide forging mark, about 8/10mm
cheers jono
#9
_192cubes_
_192cubes_
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Posted 15 May 2007 - 03:52 PM
If the crank is out of the motor, the "ring" test works, too.
Sit the crank vertically on a soft surface (bunch of rags will do) and hold it upright with one finger in the depression in the snout of the crank - in other words have minimum contact with the crank.
Now tap one of the counterweights with a small hammer.
If it has a real flat "dong" sound it's cast.
If it has a nice "ding" sound (kinda like you'd get from a bell) it's steel.
Forgings always have better resonance than castings. Don't laugh, it works.
cheers
Dave
Sit the crank vertically on a soft surface (bunch of rags will do) and hold it upright with one finger in the depression in the snout of the crank - in other words have minimum contact with the crank.
Now tap one of the counterweights with a small hammer.
If it has a real flat "dong" sound it's cast.
If it has a nice "ding" sound (kinda like you'd get from a bell) it's steel.
Forgings always have better resonance than castings. Don't laugh, it works.
cheers
Dave
#10
_oz772_
_oz772_
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Posted 01 June 2007 - 05:40 PM
Has anyone been able to confirm the part number for the steel cranks?
#11
_Drag lc_
_Drag lc_
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Posted 02 June 2007 - 07:40 AM
red 6 if you put it beside a std red crank you will see the cast counter weights will be smother on a steel one, a std one has sharp edges on counter weights. i got the part numbers of the ones that i have in the shed they are 7431320 and 7420005 hope this helps.
Thanks Hayden
Thanks Hayden
#12
_oz772_
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Posted 02 June 2007 - 12:40 PM
Thanks for that. I now have one more question though. I was under the impression that the steel cranks were the same whether they were in a 179 or a 186 (3" stroke). However, there are three steel crank part numbers identified on this thread. Were there differences in the steel cranks depending on which engine it was fitted in? Thanks
#13
red6
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Posted 18 June 2007 - 01:55 PM
finally got into the shed today and the one i have is a 7431320 so that means that i have a steel one correct?i got the part numbers of the ones that i have in the shed they are 7431320 and 7420005 hope this helps.
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