Firstly, using a rear main rope seal, is almost a thing of the past. And, has greatly diminished in use.
So, the rear main rope seal worked well, in its time. Only, as long as you completely understood the installation process.
As a result, the installation technique has slowly been lost, as they diminished in use. Furthermore, many younger installers, did not learn the technique. Because, the procedure was just far less common.
Subsequently, the rear main rope seal installation, was passed back, to the seasoned mechanic.
Because, they usually had the experience doing them once before.
Therefore, as time went by, mechanics and rebuilders, slowly came up with alternative seals to make the job easier.
Consequently, the list of alternative seals, has been growing with good success. Stopping leaks, solving problems, saving time and money.
But, don’t get me wrong, there is still a need, for a variety reasons:
- Because, there is no alternative seal available.
- For instance, your doing a repair or rebuild, and you just want to keep it original.
- For example, the rope seal may be used in a timing cover.
- Finally, many water pumps, have used rope type seals.
So, whatever the reason, they will never completely go away. And, because they are getting less common, todays mechanics, my not even know what they are.
So, it has taken many years to collect this information. Consequently, this information is feedback, from people like you. People tell us these seals have worked fine for them, but will they work for you? Furthermore, there is no guarantee that they will work 100% of the time. However, the seals listed below, have proven to be the most successful. (rear main rope seal).
Normal Split Seal Installation Instructions
During installation, offset or rotate each seal half ¼ to 3/8″ from the main cap parting line. Then, place a dab of anaerobic gel, on the ends of the seals that will butt together. In addition, lubricate the seal lip with, straight 50W oil or a bearing assembly lube.
Also, most seal manufacturers, do not recommend using white grease. Because, there have been way too many failures. As a result, of dry startups.
This is especially true in rebuilt engines, that sit on the shelf for long periods of time. So, have you ever seen a Ford 390 or 460 tear the whole lip off the seal. As a result, of being dry, it stuck to the crankshaft.
The Following Is A Suggested List, Of Rear Main Rope Seal Alternatives
In short, this list will show all the information you need:
- Firstly, the application of the engine you are working on.
- Then, the application of the engine the alternative seal came from.
- Finally, the part numbers from major gasket and seal providers.
TO SUM UP, A LIST OF REAR MAIN ROPE SEAL ALTERNATIVES |
||||||
| Working On | Came From | Detroit | Enginetech | Felpro | Rol | Victor |
| Buick 231 | Jeep 225 | 17200 | S-1389 | BS40613 | RS29470 | JV742V |
| Buick 350 | Ford 460 | 17043 | N/A | BS40032 | RS29130 | JV618 |
| Buick 400 430 455 | Ford 200 | 17042 | N/A | BS30135 | RS29050 | JV730 |
| *GM 265 283 | GM250 | 17053 | S-0629 | BS13241 | RS29005 | *JV728 |
| * Install a .090″ (2.290 mm) diameter wire in the groove, behind the seal. | ||||||
| Caddy 265 | Dodge 318 | 17032 | S1196 | BS40245 | RS29040 | JV606 |
| Ford 312 | Dodge 318 | 17032 | S-1196 | BS40245 | RS29040 | JV606 |
| Olds 260 307 330 350 403 | Ford 292 | 17175 | N/A | BS6141 | RS29310 | N/A |
| Olds 350D 400 425 455 | Ford 460 | 17043 | N/A | BS40032 | RS29130 | JV618 |
| Pont 301 | Ford 460 | 17043 | N/A | BS40032 | RS29130 | JV618 |
| Pont 350 | GMC 637 | 17091 | N/A | BS40048 | N/A | JV616 |
| Pont 455 | Caddy 500 | 17008 | N/A | BS40012 | RS29115 | JV600 |
It has also been reported that, replacing the timing cover rope seal, has proven effective on 455 Buick engines.
Use National seal Part #450446 or equivalent.
However, there are engines that use, rope anti-rotation holes in the block and cap. Consequently, they need to be filled with (RTV) and let dry overnight.
Conclusion
So, today’s rear main rope seals, are not as effective at controlling oil as they once were.
Unfortunately, many things have impacted the use of rope seals:
- Consequently, new environmental laws, limit the use of asbestos and other materials.
- Also, the efforts of manufacturers, to limit part numbers.
- Furthermore, by manipulating the dimensions of the seal to fit as many applications as possible.
As a result, the market for rear main rope seals, has greatly diminished.
BY DANNY BENDER
