Reviving a 12-Cylinder Engine: Precision Upgrades for Longevity

In a thrilling restoration saga by M539 Restorations, a forgotten 12-cylinder engine in a 1991 E31 850i from a French garden gets a new lease on life. The team, with their trademark precision, upgrades the tired V12 power plant using a 5.4L M73 block and revamped cylinder heads. Topar Motorworks works their magic with a multi-angle valve job and porting, unleashing improved airflow for added performance. With new head gaskets and bolts in place, the team meticulously torques down the bolts using a nifty torque angle gauge for that perfect touch.

The timing covers present a unique challenge, with the team skillfully removing old gaskets and employing Aqua Blast 1215 for a thorough cleaning. Delving into the contentious topic of sealing options, the team dismisses traditional paper gaskets due to their notorious oil-leaking tendencies and brittleness over time. They delve into the pitfalls of combining paper gaskets with RTV silicon sealant, emphasizing the criticality of correct application. Opting for the reliable Loctite 5923 sealer to coat paper gaskets, the team ensures a secure and easily removable seal, setting the stage for long-term engine health.

With expert guidance from Loctite, the team navigates surface roughness challenges, ensuring a flawless seal on the aged engine. Moving on to the aesthetic side, the team embarks on painting the valve pan and coolant cover, enhancing both protection and visual appeal. Addressing the hurdle of discontinued gaskets, the team educates on the importance of selecting the correct thickness based on the head gasket. Utilizing Rhino seal for a thick gasket with holes, they guarantee a snug fit, showcasing their unwavering commitment to excellence in every restoration endeavor.

Watch OEM+ Rebuild of a 37-Year-Old V12 Engine - BMW E31 850i - Project Marseille: Part 8 on Youtube

Viewer Reactions for OEM+ Rebuild of a 37-Year-Old V12 Engine - BMW E31 850i - Project Marseille: Part 8

Viewers praise the channel for being the best BMW restoration channel on the web
A 21-year-old viewer gains confidence to tackle an engine restoration project after watching the videos
Appreciation for the meticulous restoration work and attention to detail on the E31 V12 engine
Comments on the satisfaction derived from watching older engine rebuilds
Desire to own a BMW 850i after watching the videos
Compliments on the precision, work ethic, and editing of the videos
Positive remarks on the therapeutic value of watching the engine rebuilds
Admiration for the attention to detail and skills demonstrated in the videos
Mention of the commitment to safety and personal protective equipment
Excitement to hear the V12 engine roar and see the dream car in action