Ultimate TD5 Exhaust Manifold Studs & Spacer Kit for Defender & Discovery 2

What makes this the “Ultimate” kit

Our kit is built around the extended-stud and spacer setup used on TD5 exhaust manifolds to help maintain consistent clamping through repeated heat cycles. It is especially relevant for tuned Defender TD5 and Discovery 2 TD5 engines, where exhaust heat and manifold movement can put more load through the original manifold fixings.

The kit was designed around the common TD5 manifold issues, not assembled as a generic bag of studs and nuts. The stud form, spacer design and nut choice all matter because the TD5 exhaust manifold is heat-cycled hard and known for moving as it expands and contracts.

Top-quality part-threaded engineering studs

The studs supplied are extended-length M8 x 1.25 grade 8.8 part-threaded engineering studs. They are not generic fully threaded studding or threaded rod cut to length.

That matters because the engineering stud is doing more than simply filling a threaded hole. The head-side thread gives controlled engagement into the cylinder head, while the plain shank passes through the manifold and spacer stack for a cleaner load path than fully threaded rod. The limited threaded section also helps prevent over-inserting the studs into the cylinder head.

• Controlled head-side engagement reduces the risk of winding threads too deep into the cylinder head
• Plain shank through the manifold and spacer stack gives a cleaner load path than fully threaded studding
• Grade 8.8 steel gives the correct strength level for an extended TD5 manifold stud
• Cleaner, more consistent installation in a high-temperature exhaust manifold position

Copper-coated flanged locking nuts for exhaust use

The kit uses copper-coated steel flanged prevailing-torque lock nuts in M8 x 1.25, selected for exhaust manifold duty. Earlier versions of the kit used stainless Aerotight nuts; the current kit uses copper-coated steel locking nuts as the better all-round choice on steel studs in long-term heat-cycled exhaust manifold use.

• All-metal locking action suitable for high-temperature exhaust use
• Flanged face spreads load across the manifold and spacer stack
• Copper-coated steel is a more service-friendly pairing on steel studs than stainless lock nuts in long-term heat-cycled use

303 stainless spacers for the extended-stud setup

The Ultimate kit includes large-diameter precision-machined 303 stainless spacers. Their job is to support the extended-stud arrangement and help keep clamping more stable and even as the manifold expands and contracts.

These are not generic packing washers. They are part of the extended-stud setup and work with the part-threaded studs and flanged locking nuts to support the manifold fixing stack.

Full kit contents:

• 10 × extended-length M8 x 1.25 engineering studs, grade 8.8
• 10 × copper-coated flanged prevailing-torque lock nuts, M8 x 1.25
• 10 × large-diameter 303 stainless spacers
• 2 × OEM turbo oil feed banjo washers
• 1 × OEM turbo drain gasket
• 1 × OEM turbo-to-manifold gasket
• 1 × OEM turbo-to-downpipe gasket
• 3 × M10 flanged nuts for turbo to downpipe
• 3 × M8 flanged nuts for turbo to manifold