NEED HELP GUYS? fj55 piston rings!!

Submitted: Monday, Mar 08, 2004 at 11:54
ThreadID: 11093 Views:1719 Replies:2 FollowUps:2
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Howdy guy's,

The old boy and i pulled out the 2f from the fj55 on the weekend, and found that it is 40 thou over size and the pistons have 4 rings??? the service book shows that there should only be 3.

The guy at the parts shop is also stumped as to why there is 4 rings???

Can you guys help?

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Reply By: ross - Monday, Mar 08, 2004 at 13:51

Monday, Mar 08, 2004 at 13:51
Are you counting the compression rings and oil rings. My 3F has 2 compression and 3 oil rings.Also have a look at the earlier F motor
Another distant possibility is you have chev pistons in there.As the F motor was based on the old 50s 6 cyl chev, there are a few parts that are interchangeable .Dont go down this road until you have checked all of Toyotas range.Try the Toyota dealer, at least for info.
AnswerID: 49519

Follow Up By: bob - Monday, Mar 08, 2004 at 15:38

Monday, Mar 08, 2004 at 15:38
Therefore bore size is 95mm? Try ACL piston products;
87 Mitchell St
VIC (sorry no phone number)
They supply rings, bearings, gasket sets etc to almost all engine reconditioners.
Clean up a piston - any ref. number may help them.
Have just this minute completed rings/big ends, recon head in my FJ60! Coincidence! Didn't remove engine though.
FollowupID: 311318

Reply By: bob - Tuesday, Mar 09, 2004 at 09:44

Tuesday, Mar 09, 2004 at 09:44
ph 03 9285 4000
It might be a good idea to measure individual ring widths for extra info for parts jockey. Plus number of compression/oil control rings on each piston. Top ring is quoted a "ring #1" etc. Standard rings for 2F part#PS1546 may be a starting point, widths - 2.00, 2.50, & 4.00 (all dimensions in mm).
When you reassemble, ensure ring end gap is not less than 0.2mm Invert a piston to push it in "square", to the bottom of the bore.
What are you doing about bearings?
Repco are agents for ACL, but their spare parts salespeople will need to know what they're looking for.
AnswerID: 49634

Follow Up By: Synergist - Tuesday, Mar 09, 2004 at 12:11

Tuesday, Mar 09, 2004 at 12:11
Hi Bob,

I've been told that the motor in my 4by is a F motor, and not the original 2F motor, the torque is the same and with the 40 thou oversize bore it is pretty much the same as the 2F.

The pistons on the F motor have 4 rings, 2 compression- 2 oil. I've been told that the 2 oil rings were better at their job than the single oil ring pistons but it cost more to have 4 rings than 3 so they stopped making them with 4?

The crank is being reground as we speak and the bearings will come from them, as for the other parts- they are all ACL

FollowupID: 311432

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