Rear Main Rope Seal Alternatives

rope seal
rope seal

Rear Main Rope Seal Alternatives make solve your engine leak and save time

Danny’s Engine Portal supplies the following information on a rear main rope seal alternatives.

rope seal-It has taken many years to collect this information. This information is feedback from people like you. People tell us these seals have worked fine for them but will they work for you? Danny’s Engine Portal 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 ¼ 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.

Working on                         Victor          Rol          Felpro       Detroit      Enginetech     Came From


1Buick 231                            JV742V     RS29470   BS40613     17200          S-1389           Jeep 225

2Buick 350                            JV618       RS29130   BS40032     17043             N/A            Ford 460

3Buick 400 430 455               JV730        RS29050   BS30135     17042             N/A            Ford 200

GM 265/283                        JV728        RS29005   BS13241     17053          S-0629          Chev 250*

Caddy 365                          JV606        RS29040   BS40245      17032          S-1196           Dodge 318

Ford 312                             JV606        RS29040   BS40245      17032          S-1196           Dodge 318

Olds 260 307 330 350 403       N/A        RS29310    BS6141       17175            N/A             Ford 292

Olds 350D 400 425 455         JV618       RS29130    BS40032    17043            N/A             Ford 460

aPont 301                              JV618       RS29130    BS40032    17043            N/A             Ford 460

bPont 350                              JV616             N/A      BS40048   17091             N/A             GMC 637

cPont 455                              JV600       RS29115    BS40012    17008            N/A             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 overnight.