Ultimate SR20 Rebuild Guide: Part 1 – The Teardown
Checking SR20 crank endplay
It’s a good idea to check the crank endplay before we remove the crank. Since SR’s use an aluminum block, we have to clamp our magnetic dial indicator stand base to the engine stand.
We then use a pry bar to shift the crank back and forth. We measured 0.005-0.006” of crank endplay, which is within spec, but way more than this engine had before.
Breaking loose SR20 crank bolts
Now we can break the crank bolts loose. Just like with the head studs, we have to take care to relieve the pressure evenly.
SR20 FSM excerpt describing the correct sequence for removing crank bolts
Here is the correct sequence for breaking the crank bolts loose.
Removing SR20 main girdle
After getting all the bolts loose we can lift out the main girdle.
Removing SR20 main caps
The main caps are usually wedged in there pretty good, but yet again, Nissan has thought of everything! The main caps have a threaded hole in them. You can thread in one of your lower oil pan bolts into this hole and use it for more leverage to wiggle the cap out.
To get the cap out, just wiggle it like a madman while pulling up.

18 comments

  1. Nikita,
    Huge fan of what you’ve done here! Just curious when youll be blueprinting the engine and doing assembly and posting that back on moto?

    Love it thanks man!
    Ryan

    1. Yes, I’ve broken my pulley using a 3 jaw puller like that before. It can be avoided if you’re careful and make sure to have the puller perfectly squared up with the crank and don’t apply any uneven pressure when turning the bolt.

      1. I’m surprised to hear that. I’ve never had issues, but I guess I’m careful. What type of puller do you recommend?

        1. If I’m not wrong, the correct type is an harmonic balancer puller. That type pulls the pulley with two bolts that go in two threaded holes in the pulley.

          1. Well the problem is SR20 pulleys don’t have two threaded holes in them! That’s why I’ve been using a 3-jaw puller my entire life lol.

        2. A normal 3 jaw puller will work, just be careful with your placement of the arms and make sure not to let the puller bolt shift on the crank bolt. When I broke mine I was removing the pulley while the engine was in the car while trying not to hit the radiator so I had minimal space to work with and was using an open ended wrench so it was hard to not let the puller move around.

          I’m actually in the process of disassembling an engine and had no issues this time around removing the crank pulley

        3. Hello i see that you live in LA and i wanted to know ware you take your block to the machine shop? it looks like i have a rod knock and am looking to rebuild my s14 Sr20det by myself . i would like to toake it to a machine shop that does things right. ware would you recommend me to take it ? i would really appreciate it. Thanks !!! Oh and am looking forward on seen your writeup on how to assemble the engine back.

  2. However, I’m looking at RWD SR20DET crankshaft pulley photos and I don’t see those two holes. I’ve seen them in FWD SR20DE.

  3. Hi I noticed you mentioned you stay out here in la would you recommend me a machine shop to send my block and get it checked. I have a rod knock on my engine and am thinking of rebuilding it by myself for the first time. Would really appreciate the help.. thanks!!!

  4. This write up will help immensely as I’ve never tore down an SR20 before and will be doing it shortly to replace pistons and rods. Thank you for doing this and I can’t wait to see your next post about blueprinting and reinstalling everything!

  5. Absolutely thrilled to find such a well done and current article related to (disassembly) rebuilding the SR20 Part 1 however a little confused in your choice of a second topic in the series!

    Our garage and assembly area are as near yours as possible, actually we are probable several pages ahead of you now however, my son and I are anxiously awaiting continuation into your thoughts and direction on blueprinting and reassembly.

    Is there a planned date for moving forward?

Leave a Reply

Your email address will not be published. Required fields are marked *

*
*