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Basic Info.

Product Parameters

Short-P/N Decouple — A-3735 / F-MF197S / F-05026 / F-05025 / 1W-6206

Five P/Ns, all pointing back to House #4 (NA heavy-equip OEM A — the one with 438/494/CA, 7d blocks 27/C6/D6/118/669/702/722/741, 8d 14/16/20/21). But these belong to a different engine family within House #4 — not the C32/C9? Wait, let's re-sort.

Which House #4 Sub-Family?

Logged House #4 so far splits into engine-size families:

Today's A-3735+ F-05025/F-05026+ F-MF197S+ 1W-6206— the A- prefix and F- prefix + 1W- prefix are allNA heavy-equip OEM A's P/N styles for engine filter components (not just 438/CA/C6). Specifically:

• A-xxxxx= head/assembly group (OEM A uses A- + 4-digit for somefilter heads/groups, especially on mid-size industrial engines — not the C6/D6/27 blocks which are 7d numeric; A- = alphanumeric head for smaller/older engine families or specific duty)

  
  

• F-xxxxx= element (OEM A's own-badged element P/N — separate from 438/CA/1R spin-ons; F- here = "Filter element" short code in OEM A's parts book, not FKM)

  
  

• 1W-xxxx= OEM A's spin-on series (1W- = OEM A filter spin-on, cross-listed to NA-A HF/Fleetguard but OEM A-badged as 1W- for engine apps — air/lube/fuel smaller than 438/CA class)

  
  

So these five belong to the smaller NA engine in House #4 — most likely the 741 fire-pump / stationary industrial engine (C9-class, smaller than C32 marine). Recap: 7414581(741 block) = lube head on that smaller engine. Today fills the rest of that smaller engine's filter set:

A-3735 — Head/Group, Smaller NA Engine (Fire-Pump Class)

Why fuel, not lube? 741 (27-block style but 741 not 27 — 741 = 7d 741, earlier guessed stationary/gas/fire) — 741 could be lube orfuel orair. But A-3735 = A-prefix, likely fuel because:

• C32 marine fuel = C6 7d numeric (C637…) — different sub-family

  
  

• Smaller NA industrial engine (C9 fire-pump) fuel head = A- prefix in OEM A's catalog (A-3735 style) — not C6 (C6 reserved for C32 marine)

  
  

• A-3735 + F-05025/F-05026 (elements) = fuel head + fuel elements (see below)

  
  

A-3735 likely = single fuel head with 2 pads (pre + main on one casting — "combo head") OR duplex fuel head (A/B valved). Tails on elements F-05025/F-05026 Δ1 — too small for A/B duplex (duplex elements usually same PN). More likely: combo single head, 2 pads = pre (coarse water-sep) + main (fine), different element PNs Δ1 apart. Head cast would say "PRI" / "SEC" or "PRE" / "MAIN" on each pad.

F-05025 / F-05026 — Fuel Elements, Δ1

Δ1 = media/bypass/height diff (pre vs main). Both qty on BOM likely = 2 (one on head, one spare) OR qty=1 each (one pre + one main installed, spares separate line). If A-3735 = duplex (A/B), elements would be same PN → not Δ1. So combo-head 2-pad = stronger read.

F-MF197S — Element, "MF" Media + "S" Seal

F-MF197S likely = lube element for the same C9 fire-pump engine (197 mm H, ~CA30-class equivalent but OEM A F- series not CA- series). Or = fuel element bio-rated (if plant fires HVO in fire-pump for compliance — some regions mandate fire-pump HVO-ready). If F-MF197S = lube: 7414581 (head) + F-MF197S (element) = lube circuit on C9. If = fuel bio: A-3735 + F-MF197S (instead of F-05025/026) = fuel bio-rated.

BOM context: is F-MF197S near A-3735/F-05025? Or near 741? Authority.

1W-6206 — OEM A Spin-On (1W- Series)

1W-xxxx= OEM A's ownspin-on badge (air/lube/fuel smaller class, cross to NA-A HF but OEM A-badged). In OEM A's engine catalog:

• 438-xxxx = fuel spin-on (C32 class)

  
  

• CAxx-x = lube spin-on (C32 class)

  
  

• 1W-xxxx = air spin-on (smaller engines — C9/C7 class, panel/cylindrical, *5–10, paper) OR lube spin-on (C9 class, smaller than CA56 — C9 lube = 1W- not CAxx, CAxx = C32 only)

  
  

On C9 fire-pump: air filter likely = panel (not spin-on) — NA smaller engines sometimes use panel air (491- / 1R- style), but 1W-6xxx could be air can. More likely: 1W-6206 = lube spin-on on C9 (C9 lube = 1W-xxxx, not CAxx — CAxx reserved for C32). Then:

• C9 fire-pump package stitched:

  • Air: maybe 494-class smaller (not logged) or 1W-? air — 1W-6206 could be air though

    
    

  • Fuel head: A-3735 + F-05025(pre) / F-05026(main) [mineral] or + F-MF197S [bio]

    
    

  • Lube head: 7414581 (741 block) + 1W-6206 (elem) — OR 741 = fuel head? No 741 guessed stationary/gas/fire, could be lube or fuel. If 741 = lube head → 1W-6206 = lube elem. If 741 = fuel head (A-3735 then = lube? Unlikely A- = fuel style).

    
    

  
  

Actually flip: what if 7414581 = fuel head (741 block = stationary industrial fuel, not C6 because C6=C32 marine) and A-3735 = lube head (A- prefix = lube on smaller engine)? Then F-05025/026 = fuel elements (A-3735 fuel head? No A- then F- fuel — possible). But 1W-6206 = air or lube… This is ambiguous without head cast.

Safer read: A-3735 + F-05025/F-05026 = fuel circuit (combo head 2-pad, pre+main, Δ1). 7414581 = lube head (741 block, C9 class). 1W-6206 = air spin-on (C9 air, 1W-6xxx). F-MF197S = lube element bio-rated (if C9 runs HVO) OR fuel bio-rated (replace F-05025/026 on HVO days). C9 fire-pump package = air(1W-6206) + fuel(A-3735 + F-05025/026) + lube(741 + F-MF197S/1W-xxxx? Conflict — lube element not logged yet except F-MF197S).

Maybe: lube element = also 1W-xxxx (C9 lube = 1W-6206, air = different 1W-xxxx not logged). Then F-MF197S = fuel bio alternate. That works: C9 = air(? another 1W) + fuel(A-3735 + F-05025/026 std + F-MF197S bio alt) + lube(741 + 1W-6206). But then 1W-6206 = lube, not air. Okay.

最简: C9 fire-pump / small stationary NA engine package in House #4, second engine familyalongside C32 marine:

• C32 marine: air(494-6995) + fuel(C637 pre+duplex + 438-5385/5386) + lube(2707 + CA56-3) + SCAC(D636) + 8d

  
  

• C9 stationary/fire: air(1W-6206? or 494-smaller) + fuel(A-3735 + F-05025/026, + F-MF197S bio alt) + lube(7414581 + ? elem — maybe 1W-xxxx not 6206, or CAxx-smaller not logged)

  
  

Traps — House #4 Small-Engine Family (C9/Fire)

Trap 1: A-3735 = head (qty=1), F-05025/F-026 = elements (qty=2–4)

Same as C6/D6/27 traps — 7d/alphanumeric head ≠ element. A-3735 qty=1 (permanent), F-05025/F-026 qty=2–4 (consumable). Don't order A-3735 as spin-on.

Trap 2: F-05025 vs F-05026 Δ1 = pre vs main on combo head — pads labeled

A-3735 cast = "PRI" / "SEC" or "PRE" / "MAIN" on each pad. PRE pad = F-05025 (coarse, water-sep bowl maybe), MAIN pad = F-05026 (fine). Swapped = pre media in main pad (ΔP high, water knock poor), main media in pre pad (water gets through to main, main clogs faster). Must match pad label.

Trap 3: F-MF197S = "MF" media + "S" seal — likely bio/HVO rated (FKM S)

If plant fires C9 fire-pump on HVO (compliance regs), standard F-05025 (NBR, mineral) swells on HVO → need F-MF197S (FKM S, synthetic-rated media). BOM may have both: F-05025 qty=2 (mineral duty, normal ops) + F-MF197S qty=1 (bio/HVO alternate, or stored for HVO-switch day). Or F-MF197S = lubebio (C9 lube on HVO? Fire-pump engine = diesel #2 usually, not HVO — but some plants HVO-retrofit fire-pump for ESG). Old O-ring on F-MF197S = brown-red (FKM) vs F-05025 = black (NBR) → tells.

Trap 4: 1W-6206 = OEM A spin-on (air or lube, C9 class) — not 438/CA

House #4 has multiple spin-on families:

• 438-xxxx = fuel (C32 class, larger)

  
  

• CAxx-x = lube (C32 class, larger)

  
  

• 1W-xxxx = air/lube (C9 class, smaller) — cross to NA-A HF, but OEM A-badged 1W

  
  

• C6 heads take 438, D6 heads take cooling elem, 27 takes CA, 741 takes 1W or CA-small, A-3735 takes F-xxxxx

  Stores seeing "1W-6206" and thinking "generic NA spin-on" → might cross to HFxxxx, ok if approved, but channel = House #4 / OEM A dealer, not HF distributor (unless cross approved). 1W- vs 438- vs CAxx — all House #4 but different engine families.

  
  

Trap 5: A- vs C6 in House #4 — both "fuel head" but different engine families

• C6 (C637…) = C32 marine / large NA engine fuel head (duplex, 438-xxxx elements)

  
  

• A- (A-3735) = C9 fire-pump / small NA industrial fuel head (combo 2-pad, F-xxxxx elements)

  Both House #4, both fuel, different mounts/bypass/gasket. Don't swap A- head onto C32 (C6 elements won't fit A- head's pad drill/locator).

  
  

30-Second Field Lock

Near the C9 fire-pump / small stationary NA engine (tag = "FIRE PUMP - DIESEL" / "STATIONARY GEN - SMALL" / "BLACK START" — likely near fire-water pumpshed, not turbine bay):

1. A-3735 head cast — "A-3735" + OEM A logo + "FUEL" + 2 pads labeled "PRE" / "MAIN" (or "PRI"/"SEC"). Tells = fuel combo head (not duplex, not lube). Confirms F-05025/026 = pre+main elements.

   
   

2. F-05025 vs F-05026 — which pad? PRE = 025 (coarse, maybe bowl+drain), MAIN = 026 (fine, no bowl). Old O-ring both = black NBR (mineral diesel).

   
   

3. 7414581 head — near same engine? If A-3735 = fuel head on C9, 741 = lube head on C9 (741 block = stationary/fire). 741 cast = "LUBU" or "LUBE" + thread 1-1/2"-16UNF? Lube head on C9 likely takes 1W-xxxx lube spin-on (not CA56 — CA56 = C32). Then 1W-6206 = lube elem on 741 head. That stitches: C9 = fuel(A-3735 + F-05025/026) + lube(741 + 1W-6206) + air(? — C9 air maybe 1W-other or 494-smaller not logged).

   
   

4. F-MF197S — near which head? If near A-3735 → fuel bio alt (S=FKM, MF=media). If near 741 → lube bio alt. Old O-ring colour = brown-red (FKM) → bio/HVO duty. BOM qty: if F-MF197S qty=1 and F-05025 qty=2 → F-MF197S = spare alt (bio). If F-MF197S qty=2 and near 741 → lube elem (then 1W-6206 = air? Unlikely).

   
   

5. 1W-6206 — on which head? If on 741 (lube) → 1W-6206 = lube elem (C9 lube, ~CA30-class H, NBR or FKM). If on air can near engine intake → 1W-6206 = air spin-on (C9 air, cylindrical, *5–10). C9 fire-pump air = usually dry panel(not spin-on) — so 1W-6206 more likely lube.

   
   

Plant Filter House Map (Updated — House #4 Now Two Engine Families: C32 Marine + C9 Fire/Small)

House #4 now has two complete engine packages:

• C32 marine/station-service (larger): air(494-6995) + fuel-pre(C6370872?)+duplex(C6370070/0487/0367?)+438-5385/5386 + lube(2707+CA56-3) + SCAC(D636) + 8d engine PNs

  
  

• C9 fire-pump / small stationary (smaller): fuel head(A-3735, combo 2-pad) + F-05025(pre)/F-05026(main) [+ F-MF197S bio alt] + lube head(7414581) + 1W-6206(lube elem? or air?) — air not fully logged (C9 air likely 1W-other or 494-smaller)

  
  

A-3735 = "A-" prefix (not C6/D6/27) marks it as smaller NA engine familywithin House #4 — OEM A uses A- + 4d for mid/small engine heads, reserves C6/D6/27 7d numeric for C32-class. F-xxxxx = OEM A's own element badge (not 438/CA spin-on — those are screw-on cans; F- = cartridge element for headslike A-3735, maybe clip-in not spin? Or F- = spin-on in some markets). 1W-xxxx = OEM A spin-on smaller class (C9 air/lube).

Remaining Locks (6 open, House #4 C9 sub-family new)

1. 10-digit → child element PN (House #6)

   
   

2. House T element pull (225A/258A/315A/320B/342A)

   
   

3. HY1-125 pull (125 mm collision)

   
   

4. House #7 subs OEM logo (air-subs)

   
   

5. House #8 confirm (1C0… head = JP-A mobile? or comp-driver?)

   
   

6. House #9 confirm (90569×× = JP-B comp-driver? tag)

   
   

7. House #4 C9 stitch — A-3735 cast ("PRE"/"MAIN" pads?) + 7414581 cast (lube? fuel?) + 1W-6206 duty (lube elem? or air?) + F-MF197S near which head (bio fuel alt? or lube?) — locks C9 fire-pump package fully (adds to C32 package already stitched)

   
   

Cheat-sheet now ~128 P/Ns, 10 houses + T. New collision rows for House #4 internal:

• House #4 internalfamilies: C32 marine (27/C6/D6/438/CA/8d) vs C9 small (741/A-37/1W/F-) vs mobile(118/669/702) vs comp-driver(722) — same house, different engine families, heads NOT crossable (C6 head ≠ A- head, 438 elem ≠ F-0xxxx elem, CA56 ≠ 1W-6xxx)

  
  

• F- letter: House #4 (F-xxxxx = OEM A element badge, NOT FKM — FKM in House #4 is on 438/CA/1R as "F" suffix e.g. HY-10-006-F, but F- as PN prefix = element series). Position matters: F-05025F=prefix (element), `HY-10