REC50-863007A1 vs REC3885317: which marine starter fits?

ComparisonEducationalElectricalEngine Parts

REC50-863007A1 and REC3885317 look closely related, but the current catalogues list different power ratings, OEM references and application notes. We wrote this guide because online cross-reference lists often combine the same number families without explaining the difference. It compares the published evidence, explains why the listings overlap and shows what to check before ordering.

By Callum Trickett
8 min read
Article image showing two starter motors and the text: "REC50-863007A1 VS REC3885317"

Key summary

  • The current catalogues list REC50-863007A1 and REC3885317 as two separate starter motors, not as one identical part under different labels.
  • Both are published as 12 V starters with an 11-tooth pinion, a 14-inch flywheel application and diagonal fixing screws.
  • REC50-863007A1 is rated at 1.4 kW. Recmar maps it to MerCruiser 50-863007A1 and Volvo Penta 3885317, 3857747 and 3660566 as printed.
  • REC3885317 is rated at 1.7 kW and is explicitly labelled Heavy Duty. Recmar maps it to MerCruiser 50-864340A2 and Volvo Penta 3860764, with a stated 7.4-litre application.
  • Shared physical details and overlapping aftermarket cross-references do not prove that the two Recmar products are automatically interchangeable.
  • Select by the installed OEM number, engine information and physical starter layout. Do not choose the 1.7 kW model simply because its rating is higher.

View the current REC50-863007A1 1.4 kW starter motor and REC3885317 1.7 kW Heavy Duty starter motor. Use the comparison and fitment checks in this guide before selecting either product.

REC50-863007A1 vs REC3885317 at a glance

Published Recmar catalogue specifications and applications
Published field REC50-863007A1 REC3885317
Recmar reference REC50-863007A1 REC3885317
MerCruiser OEM mapping 50-863007A1 50-864340A2
Volvo Penta OEM mapping 3885317, 3857747, 3660566 as printed 3860764
Voltage 12 V 12 V
Published output 1.4 kW 1.7 kW
Pinion 11 teeth 11 teeth
Flywheel 14 inches 14 inches
Fixing Diagonal fixing screws Diagonal fixing screws
Published application emphasis Four-cylinder, V6 and V8; 3.0-litre; described for smaller engines except 7.4 litres V6 and V8; 7.4-litre
Heavy Duty wording Not used Explicitly used by Recmar
Primary catalogue source MerCruiser page 175; Volvo Penta page 704 MerCruiser page 175; Volvo Penta page 704

This table records what Recmar currently publishes. It does not establish compatibility with every engine in a broad displacement family. The Volvo catalogue visibly prints 3660566 for the 1.4 kW unit. Other sources often use 3860566, so that number requires confirmation rather than silent correction.

Are REC50-863007A1 and REC3885317 the same starter?

No, not according to the current Recmar catalogues. They share voltage, tooth count, flywheel size and fixing style, but Recmar gives them different output ratings, OEM mappings and application notes. Those common details place them in the same broad GM marine starter family. They do not prove that the two boxed Recmar products are identical or freely interchangeable.

That distinction matters because marine starters that look similar can still differ in their nose housing, pinion position, mounting dimensions, solenoid position, terminal layout or installation clearance. A shared cross-reference on a retailer's page is useful evidence, but it is not a substitute for the manufacturer's exact row or the engine's parts information.

Why do the part numbers overlap online?

Three separate things are being combined by many online listings.

REC50-863007A1 is the Recmar match for Volvo Penta 3885317

The counter-intuitive point is that Volvo Penta OEM number 3885317 appears under Recmar product REC50-863007A1, not under the similarly named REC3885317, in the current Volvo Penta catalogue.

The same Recmar row also prints Volvo references 3857747 and 3660566. The last number may be a catalogue error for the commonly listed 3860566, but that has not been confirmed. We have left the printed value unchanged.

REC3885317 is mapped to a different OEM group

Recmar maps REC3885317 to Volvo Penta 3860764 and MerCruiser 50-864340A2. It rates this starter at 1.7 kW, labels it Heavy Duty and places 7.4-litre V6/V8 wording on the row.

The supplier SKU can therefore mislead anyone who assumes that REC3885317 must be the direct Recmar match for OEM 3885317. Recmar's current index says otherwise.

A later replacement can cover an older number without being the same design

A specialist Mercury parts database reports that 50-864340A2 was superseded by 863007A1 as a functional replacement and warns that the replacement may look different from the original. That gives a sensible reason for newer listings to combine both number families.

ARCO Marine also sells one modern gear-reduction starter, part 30433, which it cross-references to 50-863007A1, 50-864340A2, Volvo Penta 3860764 and 3885317, among other numbers. This proves that a manufacturer can design one replacement to cover both older OEM groups.

It does not prove that Recmar has put the same unit in the REC50-863007A1 and REC3885317 boxes. Recmar continues to publish two rows with different ratings and application wording.

What does 1.4 kW versus 1.7 kW mean?

Kilowatts describe rated mechanical output. In this catalogue, Recmar publishes 1.4 kW for REC50-863007A1 and 1.7 kW for REC3885317.

The higher number does not, by itself, tell us:

  • how much current each starter draws on the same engine;
  • the cranking torque at the pinion;
  • the permitted cranking time;
  • how quickly either unit heats up;
  • whether one lasts longer;
  • whether one performs better during a hot start;
  • whether the 1.7 kW unit is suitable as an upgrade for every 1.4 kW application.

Those questions require technical test data that Recmar does not publish on the comparison page.

Recmar does call REC3885317 Heavy Duty. It does not call REC50-863007A1 light duty. The accurate descriptions are therefore 1.4 kW starter and 1.7 kW Heavy Duty starter, without adding claims about durability or duty cycle that the available data does not prove.

Which starter does the catalogue point to?

Evidence-led replacement direction by existing number or application
Existing number or application Evidence-led direction What still needs checking
MerCruiser 50-863007A1 Recmar points to REC50-863007A1 Confirm the engine model, serial information and installed layout
Volvo Penta 3885317 Recmar points to REC50-863007A1 Check the complete number and physical starter
Volvo Penta 3857747 Recmar points to REC50-863007A1 Confirm the engine application
MerCruiser 50-864340A2 Recmar points to REC3885317; a Mercury parts database reports later supersession to 863007A1 Decide whether you are following the original Recmar replacement or a documented current OEM supersession
Volvo Penta 3860764 Recmar points to REC3885317 Confirm the engine application and physical layout
7.4-litre application Recmar points to REC3885317 and excludes 7.4 litres from its REC50-863007A1 wording Match the installed OEM reference before ordering
3.0-litre application Recmar and current Mercury evidence point towards the 863007A1 family Confirm year, engine model, serial information and 14-inch flywheel
Part number missing or unreadable Neither product should be selected from appearance alone Photograph and measure the installed starter, then request a fitment check

Engine displacement is not enough on its own. GM-based marine engines have used several starter layouts over long production periods, and previous replacements may not look like the original factory unit.

Is the 1.7 kW Heavy Duty starter automatically better?

No. The best starter is the one that is authorised for the engine and matches the installation.

A higher published output may be relevant where Recmar specifies the 1.7 kW unit, particularly in the 7.4-litre context shown in its catalogue. It does not create a general upgrade rule. The newer 863007A1 family is itself sold as a functional replacement for some older starter numbers, which shows why output alone cannot settle the choice.

Choosing the higher-rated unit without checking the OEM reference could leave you with the wrong mounting geometry, an unsuitable pinion position or avoidable clearance problems. Choosing only by price creates the same risk.

What should you check before ordering?

  1. Read the full manufacturer and part number from the installed starter. Photograph the label before cleaning it.
  2. Record the engine make, model, year and serial number. Use the engine parts diagram where available.
  3. Check whether the OEM reference belongs to the 50-863007A1 / 3885317 group or the 50-864340A2 / 3860764 group in the current Recmar catalogue.
  4. Confirm that the electrical system is 12 V.
  5. Count the pinion teeth and inspect their condition.
  6. Confirm the flywheel application. Both Recmar rows show 14 inches.
  7. Check the diagonal or offset two-bolt mounting pattern. Measure the bolt centres rather than judging them from a photograph.
  8. Compare the nose housing, flange-to-pinion distance and pinion rest position.
  9. Compare the solenoid position, terminal sizes and terminal clocking.
  10. Check whether mounting bolts, a tail bracket or other hardware are required. A replacement starter may use different hardware even when it is a functional substitute.
  11. Check clearance around the sump, manifolds, bellhousing and wiring.
  12. If the numbers conflict, send clear photographs from the drive, mounting and terminal sides with the engine information before ordering.

You can browse marine starter motors, MerCruiser starter motors and Volvo Penta starter motors. For an uncertain application, ask TMP Global to confirm starter-motor fitment before placing the order.

Check the starting system before condemning the starter

A slow or non-cranking engine is not always evidence of a failed starter. Check battery condition, terminal security, cable voltage drop, the engine earth, isolation switches and the starter relay or solenoid first. Damaged ring-gear teeth can also produce intermittent engagement problems.

TMP Global's marine battery buying guide explains the difference between starting and domestic battery requirements. A battery or cable fault should be corrected before a new starter is used to mask the symptom.

Comparison verdict

REC50-863007A1 is the current Recmar catalogue match for MerCruiser 50-863007A1 and Volvo Penta 3885317, with a published rating of 1.4 kW. REC3885317 is Recmar's 1.7 kW Heavy Duty listing for MerCruiser 50-864340A2 and Volvo Penta 3860764, with a stated 7.4-litre application.

Their shared 12 V, 11-tooth, 14-inch and diagonal-fixing details explain why they look related and why universal aftermarket replacements can cover both number groups. Those similarities do not prove that the two Recmar products are identical. Match the OEM reference and engine application first, then confirm the physical starter.

Frequently asked questions

Are REC50-863007A1 and REC3885317 the same starter motor?

No, not according to the current Recmar catalogues. Recmar lists different output ratings, OEM mappings and application notes. They belong to the same broad starter family, but automatic interchangeability has not been established.

Which Recmar starter replaces Volvo Penta 3885317?

The current Recmar Volvo Penta catalogue places OEM 3885317 under REC50-863007A1, the 1.4 kW listing.

Which Recmar starter replaces Volvo Penta 3860764?

The current Recmar Volvo Penta catalogue maps OEM 3860764 to REC3885317, the 1.7 kW Heavy Duty listing.

Which Recmar starter replaces MerCruiser 50-864340A2?

Recmar maps 50-864340A2 to REC3885317. A specialist Mercury parts database reports that the older OEM number was later superseded by 863007A1 as a functional replacement. Confirm which replacement route applies to the exact engine and serial range.

Which model does Recmar call Heavy Duty?

Recmar applies the Heavy Duty wording to REC3885317, rated at 1.7 kW. The catalogue does not publish enough test data to convert that label into claims about longer cranking time or service life.

Is REC50-863007A1 a light-duty starter?

Recmar does not use that description. It publishes a 1.4 kW rating and positions the starter for smaller diagonal-fixing applications, excluding 7.4 litres in the MerCruiser catalogue wording.

Can I fit the 1.7 kW model instead of the 1.4 kW model?

Do not assume so. The shared voltage, tooth count, flywheel size and fixing style are not a complete compatibility test. Confirm the OEM reference, engine application and physical dimensions first.

Do both starters use an 11-tooth pinion and a 14-inch flywheel?

Yes. Recmar publishes those details for both starter rows. They are useful identification checks, but they do not settle every aspect of fitment.

Which starter is listed for 7.4-litre applications?

Recmar lists REC3885317 for the 7.4-litre application. Its wording for REC50-863007A1 specifically excludes 7.4 litres.

What information should I send for a fitment check?

Send the engine make, model, year and serial number, the full number from the installed starter, tooth count, mounting measurements and clear photographs from the drive, mounting and terminal sides.

Sources

Sources checked 21 July 2026.

  1. Recmar MerCruiser catalogue, printed page 175. Exact rows for REC50-863007A1 and REC3885317.
  2. Recmar Volvo Penta catalogue, printed page 704. Exact rows and Volvo Penta OEM mappings.
  3. Mercury Marine Quicksilver 863007A1 product information. Current 863007A1 application and identification information.
  4. Mercruiserparts.com record for superseded 50-864340A2. Specialist parts-database evidence for the directional replacement to 863007A1.
  5. ARCO Marine 30433 replacement starter. Manufacturer evidence that one modern replacement can cover both OEM number groups.

 

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