dwb
Proven Member
- 813
- 560
- Sep 9, 2021
-
Broomfield,
Colorado
Maybe I should be posting this in the noob forum because I'm definitely a noob when it comes to engine rebuild. But hopefully there will be some good info here anyway. Maybe this stuff has already been discussed but it's hard to search this site.
I'm prepping my 6bolt turbo head, block, and crank to take to the machine shop after a timing belt mishap and 270k miles on the bottom end. I'm not looking for much more than an OEM rebuild and I will do all the assembly myself. The head I will be using was pulled from this same running engine at 220k, so no known bent valves or warpage. I do not believe anything has ever been machined before. So far I've found no major damage. The crank has a little scoring that can likely be polished. Bores don't have any deep scoring but will need to be machined. I haven't yet removed the valve springs so I'm unsure the condition of the valve seats or the valves.
So the block and crank are basically ready to go. Before I take them in, what, if anything, should I do to them? Should I send the block with the main bolts and caps? What about balance shaft bearings, freeze plugs, oil plugs, dowel pins, and studs - should I remove any of those beforehand? What should I be asking my machinist to be doing specifically and should I bring a spec sheet of what I expect? Again, being a noob I'm not sure what to ask or provide.
As far as the head, I'll definitely have it decked. At what point do I need to have the seats machined? Seems that might get expensive. If I plan to reuse the valves, do those have to be machined or can they just be cleaned and lapped?
All this is uncharted territory for me but I'm really excited to get the opportunity (aka wife said OK). Thanks for everyone's input so far!
Probably more questions to come...
I'm prepping my 6bolt turbo head, block, and crank to take to the machine shop after a timing belt mishap and 270k miles on the bottom end. I'm not looking for much more than an OEM rebuild and I will do all the assembly myself. The head I will be using was pulled from this same running engine at 220k, so no known bent valves or warpage. I do not believe anything has ever been machined before. So far I've found no major damage. The crank has a little scoring that can likely be polished. Bores don't have any deep scoring but will need to be machined. I haven't yet removed the valve springs so I'm unsure the condition of the valve seats or the valves.
So the block and crank are basically ready to go. Before I take them in, what, if anything, should I do to them? Should I send the block with the main bolts and caps? What about balance shaft bearings, freeze plugs, oil plugs, dowel pins, and studs - should I remove any of those beforehand? What should I be asking my machinist to be doing specifically and should I bring a spec sheet of what I expect? Again, being a noob I'm not sure what to ask or provide.
As far as the head, I'll definitely have it decked. At what point do I need to have the seats machined? Seems that might get expensive. If I plan to reuse the valves, do those have to be machined or can they just be cleaned and lapped?
All this is uncharted territory for me but I'm really excited to get the opportunity (aka wife said OK). Thanks for everyone's input so far!
Probably more questions to come...