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Rear Main Rope Seal Alternative
The AERA Technical committee supplies the following information on a rear main rope seal alternative. The information provided below was collected over many years. This information is feedback from people like you. People tell us these seals have worked fine for them but will they work for you? AERA expresses no guarantee that they will work 100% of the time but the seals listed below have proven to be the most successful.
During installation, offset or rotate each seal half ? to 3/8 from the main cap parting line. Place dab of anaerobic gel on the ends of the seals that will butt together. Lubricate the seal lip with straight 50 W oil or a bearing assembly lube as those lubes that will stay in place until the engine is started. Seal manufacturers do not recommend white grease alone, because they have seen too many failures from dry startups. This is especially true in rebuilt engines that sit on the shelf for long periods of time before being put into service. This is why you may have seen chunks torn out of the contact face of the seals that have
leaked. If you have ever seen a Ford 390 or 460 tear the whole lip off the seal, it happened because it was dry started and stuck to the crankshaft.
Engine to Detroit Enginetech FM ROL Victor Actual
Be repaired Application
Buick 231 17200 S-1389 BS-40613 RS-29470 JV-742-V Jeep 225
Buick 350 17043 N/A BS-40032 RS-29130 JV-618 Ford 460
Buick 455 17042 N/A BS-30135 RS-29050 JV-730 Ford 200
GM 265/283 17053 S-0629 BS-13241 RS-29005 JV-728 Chev 250*
Caddy 365 17032 S-1196 BS-40245 RS-29040 JV-606 Dodge 318
Ford 312 17032 S-1196 BS-40245 RS-29040 JV-606 Dodge 318
Olds 260 307
330 350 403 17175 N/A BS-6141 RS 29310 N/A Ford 292
Olds 350D
400 425 455 17043 N/A BS-40032 RS-29130 JV-618 Ford 460
Pontiac 301 17091 N/A BS-40048 N/A JV-616 GMC 637
Pontiac 350 17043 N/A BS-40032 RS-29130 JV-618 Ford 460
Pontiac 455 17008 N/A BS-40012 RS-29115 JV-600 Caddy 500
* Install a .090 (2.290 mm) diameter wire in the groove, behind the seal.
It has also been reported that replacing the timing case rope seal with a National seal Part #450446 has proven effective on 455 Buick engines. On engines which use rope anti-rotation holes in the block and cap, fill them with RTV and let dry over night.
The AERA Technical Committee
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