BROKEN BENTLEY / ROLLS ROYCE 6 ¾ L-Series V8 Full Engine Teardown

Summary

The narrator tears down a broken 1987 Bentley Mulsanne V8 engine obtained from a salvage yard. He details the unusual and antiquated features of the engine, including its CIS fuel injection system, gear-driven valvetrain, and lack of cam bearings. As he disassembles the engine on a difficult-to-use stand, he uncovers damage from apparent hydrolock as well as previous disassembly attempts. He removes each component, assessing wear and marveling at the intricate machining. After 8 grueling hours, he confirms his theory that the engine sucked in water, bent a connecting rod, and punched holes in the oil pan and block.

Takeaways

• 😲 The video details tearing down a broken 6.75L V8 Bentley engine from 1987
• 😎 The engine is very complex and tricky to disassemble due to tight spaces and odd fastener sizes
• 🧰 Many custom tools and creative problem-solving techniques are required during the process
• 🔨 There is damage from both the engine failure itself and from someone trying to get it apart
• 🔎 Upon inspection, it appears a piston hydrolocked against a counterweight, breaking a connecting rod
• ⚙️ The engine features some interesting old technology like a mechanical fuel injection system
• 🔧 Dissassembly takes 8 very challenging and frustrating hours
• 🤔 The presenter believes cheap oil and infrequent changes contributed to the failure
• 🛠 Despite difficulties, it's a rare chance to tear down an old English engine
• 😊 The presenter has great appreciation for the experience and learning opportunity

Q & A

What kind of engine is being taken apart in the video?

A 6.75 liter V8 engine from a 1987 Bentley Mulsanne S.

What fuel injection system does this engine use?

It uses a Constant Injection System (CIS) with a fuel distributor.

What caused the failure of this engine?

The engine seems to have been hydrolocked, likely from sucking in water, which bent a connecting rod and punched holes in the oil pan and engine block.

How much horsepower and torque did this engine produce originally?

Around 230 horsepower and 400 ft-lbs of torque.

What complications were encountered when mounting the engine on the stand?

Non-standard bolt sizes made it very difficult, taking over an hour just to mount the engine.

How long did the full teardown process take?

The full teardown took around 8 hours, much longer than normal.

What previous repair attempts were evident on the engine?

The cylinder head had been poorly resurfaced and there were saw marks where someone had cut the oil pan in half to aid disassembly.

What driven camshaft design is used in this engine?

It uses a gear driven camshaft rather than a belt or chain.

What are some unique or notable design elements of this engine?

The gear driven valvetrain, two-piece timing cover, use of cotter pins to secure internal components, and lack of camshaft bearings.

How many engines has the narrator torn down on this YouTube channel?

Over 170 engines across various types, brands and configurations.