E1866PC20-3P

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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-316-4901

Item Name Code

10849

Assigment Date

01/01/1963 (63 years ago)

unthreaded 1st inlet inlet connection type, 39.688 inches nominal overall diameter, flange 2nd inlet inlet connection type, 13.625 inches nominal 1st outlet13.625 inches nominal outlet inside diameter, 81.688 inches nominal overall length

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Overall Length: 81.688 inches nominal
Inlet Connection Type: flange 2nd inlet
Inlet Connection Type: unthreaded 1st inlet
Overall Diameter: 39.688 inches nominal
Outlet Inside Diameter: 13.625 inches nominal 1st outlet13.625 inches nominal
Design Type: wet
Coolant Type: water
Muffler Design: straight through
Body Shape: round
Operating Position: horizontal
Inlet Location: located 24-1/2 in. from center to flat end of muffler on left side looking aft single inlet
Inlet Projection Length: 24.000 inches nominal single inlet24.000 inches nominal
Inlet Flange Shape: round single inlet
Inlet Flange Mounting Provision And Quantity: 19 holes single inlet19 holes
Inlet Flange Mounting Hole Diameter: 1.000 inches nominal single inlet1.000 inches nominal
Inlet Flange Mounting Provision Spacing: 17-3/8 in. dia bolt circle single inlet
Inlet Outside Diameter: 19.125 inches nominal single inlet19.125 inches nominal
Inlet Inside Diameter: 13.625 inches nominal single inlet13.625 inches nominal
Outlet Connection Type: flange 2nd outlet
Outlet Connection Type: unthreaded 1st outlet
Outlet Location: located 34-9/16 in. from center line of inlet to center line of outlet on left side looking aft 1st outlet
Outlet Projection Length: 24.000 inches nominal 1st outlet24.000 inches nominal
Outlet Flange Shape: round 1st outlet
Outlet Flange Mounting Provision And Quantity: 19 studs 1st outlet19 studs
Outlet Flange Mounting Hole Diameter: 1.000 inches nominal 1st outlet1.000 inches nominal
Outlet Flange Mounting Provision Spacing: 17-3/8 in. dia bolt circle 1st outlet
Outlet Outside Diameter: 19.125 inches nominal 1st outlet19.125 inches nominal
Water Inlet Connection Type: unthreaded
Water Inlet Location: center located 11 in. from center line of exhaust inlet
Water Inlet Projection Length: 24.063 inches nominal
Water Inlet Flange Shape: round
Water Inlet Flange Bolt Hole Spacing: 9-1/2 in. dia bolt circle
Water Inlet Flange Bolt Hole Quantity: 8
Water Inlet Flange Bolt Hole Diameter: 0.875 inches nominal
Water Inlet Outside Diameter: 11.000 inches nominal
Water Inlet Inside Diameter: 6.000 inches nominal
Water Outlet Connection Type: flange
Water Outlet Quantity: 1
Water Outlet Location: near exhaust outlet toward center of muffler
Water Outlet Projection Length: 24.063 inches nominal
Water Outlet Flange Shape: square
Water Outlet Flange Bolt Circle Diameter: 9.500 inches nominal
Water Outlet Flange Bolt Hole Quantity: 8
Water Outlet Flange Bolt Hole Diameter: 0.875 inches nominal
Water Outlet Outside Diameter: 11.000 inches nominal
Water Outlet Inside Diameter: 6.000 inches nominal
Hand Hole Quantity: 2
Material: nickel alloy or steel location not otherwise specified
Material Document And Classification: mil-n-894 mil spec 1st material response or mil-s-853 mil spec single material response
Reference Number Differentiating Characteristics: port

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
20-3D1855P	Exhaust Muffler
D1855	Exhaust Muffler
D1855PC1T040	Exhaust Muffler
E1866PC20-3P	Exhaust Muffler

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 2990-00-316-4901?

The FSCG of the NSN 2990-00-316-4901 is 2990

Does the NSN 2990-00-316-4901 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-316-4901 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 2990-00-316-4901 contain precious materials?

Item does not contain precious metal.

Does NSN 2990-00-316-4901 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 2990-00-316-4901 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963