[TR] TR4/Webers - that banging noise- #2

[gtwincams at gmail.com]

Plastigage is what is typically used to check bearing shell clearances and requires no measuring device; the package includes printed bars that are compared to the squashed platigage. Comes in two size ranges - red and green to denote.
I've built about ten engines now  and always use Plastigage to check machine shops work after crank grinding or polishing. A mic can be used to check wrist pins and a bore guage to check the wrist pin bushing, but the machine shop can do this well, as they should always do when fitting new bushings.
Cheers,
Greg Tatarian
Lotus Elan S4
TR6
Alfa GTV
Sent via BlackBerry by AT&T

-----Original Message-----
From: "Michael Marr" <mmarr at notwires.com>

Date: Sat, 8 Aug 2009 11:35:59 
To: Lee&John Howard<leejohn7 at gmail.com>; tom white<tswhitez123 at hotmail.com>
Cc: <triumphs at autox.team.net>
Subject: Re: [TR] TR4/Webers - that banging noise- #2


Or you could use plastigage, which only requires a 0-1" micrometer to 
measure the clearance:

http://www.team-integra.net/sections/articles/showarticle.asp?ArticleID=1213

Mike

----- Original Message ----- 
From: "Lee&John Howard" <leejohn7 at gmail.com>
To: "tom white" <tswhitez123 at hotmail.com>
Cc: <triumphs at autox.team.net>
Sent: Saturday, August 08, 2009 11:02 AM
Subject: Re: [TR] TR4/Webers - that banging noise- #2


> Excellent idea, Tom. I'll do that and report back.
> John
>
> On Sat, Aug 8, 2009 at 8:19 AM, tom white <tswhitez123 at hotmail.com> wrote:
>
>>  You say the rod bearing was in place and torqued properly.  To be 
>> certain
>> the bearing is OK you need to measure the clearances with a micrometer.
>> Measure the rod journal and note the diameter.  Then place the rod 
>> bearing
>> in the rod cap and torque the cap while the rod is off of the crank. 
>> Then
>> measure th inside diameter of the bearing.  Subtract the journal diameter
>> fromt the bearing diameter to get the amount of clearance.  Compare your
>> answer to book specs.
>>
>> Best regards, Tom
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