So what started out as a simple valve job quickly escalated into an engine rebuild.
Since initial purchase of car I knew that a valve job was on order for the near future. Usual symptoms, smoke on overrun but not enough to cause any real concern.
Figured while we were in there I should add a hotter cam IE 292, etc.. and maybe splurge on Weber DCOE’s.
Fast forward to late September. My searching has yielded both a rebuilt E21 Head with Norris 300° cam ready to bolt on and a pair of lightly used Weber 40’s!
Just to confirm that block could handle upgrades I called Matt at SCR to schedule a leakdown test on the cylinders.
Insert photo results here.(#’s ran from 20%-80%)
Ouch!!! My heart stopped beating for at least a minute. I did everything to not puke on the shop floor and was a complete loss of words while Matt was consoling me with the cancer speech, not today or tomorrow but sometime in the future..
Matt was confident that engine would continue to run just as it had been for 40+ years if I didn’t redline it and go crazy. It would really come down to my decision for when I was ready to take it off the road. It would have probably been more cost effective to find a suitable replacement but with #’s matching and not wanting to risk same issue or worse with another block I decided to go down rebuild path.
I loaded the trunk with every tool and fluid imaginable, crossed my fingers and drove 230 miles through torrential downpours to my folks house in NH for the BavAuto Show and Shine. My wife was following me in her 2013 X3 and could hardly keep up with my pace. Guess I was determined to coast into town in neutral if engine gave out!
After some scheduling conflicts were worked out Scott Sislane and Matt Pickering showed up early one Sunday morning to help with engine pull.
Off to the machine shop!
BAKE/BLAST/ CYLINDER BLOCK
MAGNAFLUX CYLINDER BLOCK
JET WASH/FINAL CLEAN CYLINDER BLOCK INSTALL BRASS BLOCK PLUG
SQUARE & DECK W/TIMING COVER CYLINDER BLOCK
CHECK/ RADIUS/MICROPOLISH CRANKSHAFT JETWASH/FINAL CLEAN CRANKSHAFT MAGNAFLUX RODS
CHECK CON ROD BE/ALIGN
R&R PIN BUSHING/FIT/ALIGN
JETWASH/FINAL CLEAN CONNECTING ROD SET FILE FIT PISTON RINGS
R & R DOWEL PINS
R & R ROCKER ARMS
DEGREASE CYLINDER HEAD
PRESSURE TEST CYLINDER HEAD
VACUUM TEST CYLINDER HEAD
RESURFACE CYLINDER HEAD
BavAuto Order/Parts #’s
|11 12 0 621 144||Head Bolt – Sold Individually||
|11 31 1 744 KIT||Timing Chain Tensioner Kit||
|11 31 0 731 105||Timing Chain – Dual Row||
|11 41 1 716 989||Oil Pump Chain||
|11 41 1 250 427||Oil Pump Shim – .1mm||
|11 21 0 666 110||Main Bearings – Standard Size||
|11 24 1284550/4||Connecting Rod Bearings – standard||
|11 24 0 618 110||Connecting Rod Nut and Bolt||
|33 32 1 140 568||*BOLT Main Caps||
|11 11 1 735 525||*BOLT Main Caps||
|11 51 1 256 600||Water Pump and Gasket – Aftermarket||
|11 11 1 734 114||Bottom End Gasket Set||
|11 12 9 065722K||Head Gasket Set – E12 And E21 Cylinder Head||
Pistons from Top End Performance:
BMW M10 with E21 Casting JE 2618
Alloy forged pistons with wrist pins and JE Rings 9.8:1 CR
Updated photo’s from machine shop will follow shortly along with step by step engine assembly.