The Mercury Lower End Cap Assembly 1156-7809T1 is a genuine Mercury Marine OEM component used in the cylinder block and end caps section of many legacy Mercury, Mariner, and Mercury Racing V6 two-stroke outboards. In older listings, this same part family may also appear as 7809T1, with earlier superseded references including 7809A1 and 6312A1.
If you are rebuilding or refreshing a classic Mercury V6 powerhead, this is one of the key lower block-end components to match correctly.
What the lower end cap assembly does
The lower end cap assembly is part of the block/end-cap structure at the lower end of the powerhead. Because Mercury catalogs it together with dedicated seals and an O-ring, correct fit and sealing are important anytime the block is apart. Using the correct OEM lower end cap helps maintain proper fit with the surrounding cylinder block and sealing surfaces during assembly.
Genuine Mercury OEM quality
This is not a generic aftermarket substitute. 1156-7809T1 is sold as a genuine Mercury Marine factory OEM part, which matters on internal engine components where machining accuracy, sealing, and fit are critical.
Fitment: legacy Mercury, Mariner, and Mercury Racing V6 families
Mercury and aftermarket catalog references show 1156-7809T1 / 7809T1 used across a wide range of legacy 2.0L, 2.4L, and 2.5L V6 two-stroke engines from roughly the late 1970s through the mid-2000s.
Common horsepower and model families tied to this part include 105 Jet, 140 Jet, 135 HP, 150 HP, 175 HP, 200 HP, XR4 / Magnum II, XR6 / Magnum III, V-135, V-140, V-150, V-150 XR-2, V-150 Magnum, V-150 Marathon, V-175 (Ski), V-200, V-200 EFI, V-200 XRi, 150 EFI, 175 EFI, 200 EFI, 150/200 EFI (2.5L), 200 EFI Pro Max / Super Magnum, 150 EFI Pro Max / Super Mag, 225 EFI Pro Max / Super Magnum, 225X EFI Pro Max, and 200XS DFI (2.5L).
This lower end cap assembly also appears in related SportJet / Jet Drive applications, including 175XR2 Jet Drive, 210 Carb Jet Drive, 210 Carb M2 Jet Drive, 240 EFI Jet Drive, and 240 EFI M2 Jet Drive.
If you are running a legacy 2.0, 2.4, and 2.5 Liter 2-stroke, 1156-7809T1, 7809T1, or show superseded references 7809A1 or 6312A1, you are in the correct lower-end cap assembly family.
This kit already includes the matching seals
This kit is especially helpful because it already includes the matching sealing parts needed for the job: one (1) 25-62700 O-ring and two (2) 26-41953 end-cap seals. Those are the same companion parts commonly shown with this assembly in Mercury parts diagrams, so you do not have to source them separately.
Helpful ordering note
The Mercury Lower End Cap Assembly 1156-7809T1 is a genuine OEM part used across a broad range of classic 2.0L, 2.4L, and 2.5L Mercury V6 two-stroke engines, from XR4 and XR6 / Magnum III fishing motors to Pro Max, 225X, and 200XS DFI performance applications.
If your Mercury parts diagram calls for 1156-7809T1, 7809T1, 7809A1, or 6312A1, this kit gives you the one (1) x 7809T1 lower end cap assembly, plus the matching one (1) x 25-62700 O-ring and two (2) x 26-41953 seals in one package.
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.