Blown Head Gasket - Datsun 240Z Engine Restoration (Part 1)

In this video, I'm completely disassembling the engine from the Datsun 240Z. The engine revealed quite a lot of secrets. A lot of hidden damage and strange stuff came to light. I found several broken bolts, damaged threads, a performance camshaft, upgraded valve springs, a blown head gasket, broken valves, messed up valve guides, corrosion in the cylinder, chipped valves, and so on. Due to the massive corrosion on the cylinder head in cylinder 6, I decided to replace it with another one. Big thanks to DCW Classic for sending me a new cylinder head. It's also an E88 type head, but actually the better early style version with the smaller combustion chambers. The chamber is 15% smaller than on my original head, which means it will result in a higher compression ratio. After close inspection, I noticed the new head also needed quite some work. The valve seats were really worn and had to be replaced. The valve guides were only semi good, so while I'm at it, I'm replacing them as well. The head also had a messed up thread, had been resurfaced before, and was slightly warped on top. At least it provided a lot of interesting content! All the machining on the block and head, as well as the work on crankshaft and connecting rods, was done by „Delta-Motor AG“ in Switzerland. Huge thanks at this point to the team at „Delta-Motor AG“ for letting me film in their machine shop and for sharing their time and knowledge to help me restore my engine. They did a fantastic job, and their over 40 years of experience really showed. In this video, I restored the block, head, crankshaft, and connecting rods. The pistons and valves were replaced with brand new ones. The machine shop: www.delta-motor.ch Connecting rod balancing video: www.youtube.com/watch?v=WavBc684cvE I hope you like my work and the video. Huge thank you to all of my Patreon supporters and especially to: Adel AlSaffar August Hammer Sigoss Family Bethany Burns Bold Cheddar Clint Fisher Dane Prince Derilas Edward Conway Georges Massot GibsonFinishing Ian Henry John Shebanow Joseph Kamps Keith McComb Kerem Yollu Kyle O'Keefe Lambda AI Cloud Marcus H. Michael Fleisher Michael Kemmet Michael Sheffield Nicholas Nick Houston NoLoneSurvivor Peter Cyprian Peter Pearson ReddDirt Ryan Pickett Scott Tomlin Shao Zhang Tory2025 Tyler Carruth Vickie Bligh Vince Valenti Yale Baker AbsolutMadLad Albert Siemers Alex Herstedt Alex Manning Alex Reichert ALightOTW Andre Andrew Shone Arni Bjorgvinsson Ben Simmonds Benny Brian Hoerl Caleb Betczynski Chad Bryant Chris Faehl Chris Visscher Chris Walter Christian Fjelldal Christopher Allen Christopher Lobay Cristian UNGUREANU Cyril Damien Fuller-Sutherland Daniel Varga Dave Hardware David Lehnus David P Hruska David Thompson Derson Jacomini Drew Spickes Dustin Davis Erik Nordby Ethan Mc Hakan Uzunoglu IowaTrumpet1 Jack Curry James Hare jbjellerup Jeff Agner Jesus Fernandez Cortes Johnatan Brinson Joseph Coates Justin Miller Kiro Ivanovski Labradog Laurent Bolli Lhank Lil' Brummbino Marc Cerisier Mary Casella Matt Matthew Matthew Johnson MDC Michał Święcki Mickael Alves Mihai Nathan Fariss Norbert Spaar Oleksandr Pat Nakajima Raoul Kriesi Rebekah Stone RedKnight repülő búgás Richard Venne Roan Fryer Robert Landrum Rudi Farrell Rupert Purcat Sarah B. Scott Marshall SirAleks Spencer Kormos Stanley Dimant Stefan Heymanns Stella.R Svenja Kuckla Tim Holt Timofey Lychik Tleaf Tom Detka Trevor Kam Tucker Ifft William If you have any questions about the process, machines i'm using or other stuff, just ask me in the comments. I read them all and i try to reply as soon as possible. Sorry for my bad english, it's not my language. I try my best to improve my technical english. Subscribe for more of my content. I'm uploading videos about mechanical stuff, as new creations and buildings and also restorations. Thank you for watching :-) „I make a new one“ T-Shirts: https://teespring.com/stores/my-mechanics My Main Channel: https://www.youtube.com/mymechanics My Second Channel: https://www.youtube.com/c/mymechanicsinsights My Patreon Page: https://www.patreon.com/mymechanics