253 Conrod Bearings - Holden Technical Talk

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Fastlane » Holden Forums » Holden Technical Talk » 253 Conrod Bearings

253 Conrod Bearings

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HQ_SS_Andy		#1 Posted : Sunday, 31 July 2022 3:52:50 PM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 22/08/2020(UTC) Posts: 40 Location: Sydney Thanks: 10 times Was thanked: 1 time(s) in 1 post(s)		The conrod bearings on the 253 I'm rebuilding are stamped: Holden R5J RM50U Does anyone know if these are standard or oversize ? Rgds.


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HK1837		#2 Posted : Monday, 1 August 2022 9:42:00 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,728 Thanks: 1 times Was thanked: 513 time(s) in 489 post(s)		They should have a 3 digit number on them if they are under size, like 001, 010, 020 etc. I reckon they will be STD. A simple measure of the journal will tell.
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1 user thanked HK1837 for this useful post.		HQ_SS_Andy on 3/08/2022(UTC)
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HQ_SS_Andy		#3 Posted : Tuesday, 2 August 2022 6:58:16 PM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 22/08/2020(UTC) Posts: 40 Location: Sydney Thanks: 10 times Was thanked: 1 time(s) in 1 post(s)		Thanks HK. No 3 digit numbers on them. I suspect they are standard. Pistons are standard. I would measure the journal but cannot find a spec in the manual. Any idea what it should be ? Rgds.


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Smitty2		#4 Posted : Tuesday, 2 August 2022 9:32:16 PM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 6/07/2019(UTC) Posts: 384 Location: bayside Melbourne Thanks: 238 times Was thanked: 28 time(s) in 28 post(s)		Originally Posted by: HQ_SS_Andy Thanks HK. No 3 digit numbers on them. I suspect they are standard. Pistons are standard. I would measure the journal but cannot find a spec in the manual. Any idea what it should be ? Rgds. my Holden engine manual says - Connecting rod journal diameter 2.124 - 2.125" out of round .005" MAX Bearing clearance .0007 - .0022" HTH
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1 user thanked Smitty2 for this useful post.		HQ_SS_Andy on 3/08/2022(UTC)
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