Rainman Systems were designed so that repairs and maintenance can be carried out in the field – without having to return the system to a service facility. Please give us a call, or send us a detailed email with a photo or video that best describes your service request – we’ll be happy to provide Rainman customers all of the assistance necessary to get you back online – or if you prefer, we can arrange the shipping of your system back to our facility here in Ft Lauderdale so we can take care of it and return it as soon as possible. 

How To Change The Packings

We would estimate that you need to change the packings every 4-6 years – this can be completed on board, or we welcome your system at our facility for service. Customers who purchased their system through Seatask receive a discount of labor and parts – Learn more here.

1.Remove head bolts using 5mm hex wrench and slide manifold away from crankcase. (It is normal for some packing assemblies to remain on the plungers).Note: it may be necessary to rotate crankshaft and/or use pry bars to separate manifold from crankcase.

2. Inspect plungers for cracks, scoring or build up and replace/clean as needed.

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3. Insert 18 mm extractor collet through seal retainer. Tighten collet and extract packing assembly from manifold. Clean and inspect cavity for unusual wear, cracks, etc.1

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4. Note: do not grease any portion of the packing assembly during this process. Set high pressure seal insertion collar in manifold cylinder. Assemble Glyd rings (positions 5 & 6) and gently place inside cylinder tool so they are resting evenly. Insert pusher tool and firmly press down to set packing in manifold

5. Set insertion collar over seal casing (position 4) and ensure recess for seal is facing upwards. Gently place low pressure seal (position 2) into collar ensuring the spring side of the seal is facing downward and resting evenly. Insert pusher tool into collar and firmly press down to set seal in casing.

6. Install o-ring (position 3) so its properly seated in the middle groove on the casing groove that doesnt have through holes. Installation in the wrong groove will impede the flow of cooling water resulting in premature seal failure.

7. Place seal case into manifold cylinder with low pressure seal facing upwards. Firmly press into cylinder until properly seated and repeat for each cylinder.

8. Apply a light coating of silicone grease to each plunger, then rotate crankshaft so center plunger is furthest forward (by rotating impeller – easiest way)

9. Slide seal retainer ring over the plunger until seated in crankcase. Ensure o-ring (position 3) is positioned so crankcase opening will receive aligned portion. NOTE: a small amount of silicone grease on the backside of the retainer ring will help secure it in place.

10. Slide manifold assembly on to center plunger first, then align to outer plungers whilst pushing towards crankcase. NOTE: A pair of makshift 6mm alignment pins will minimize chance of seal damage at this point – see above illustrations for details.

11. Once manifold is properly seated, install head bolts and begin torque sequence as illustrated. Tighten to 10.8Nm or 8.0 Ft-lbs

Parts Store

You can easy purchase all supplies required from our online parts store!

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