I am getting an entire ALH engine with bad rod bearings, the head has less than 10,000 miles on it confirmed because I’m the one who put it on. I’m wanting to swap the ALH head onto my BHW I have dont a little searching and have seen I need the head, accessory bracket, add the ALH block idler roller. Is there an actual write up on this swap or can anyone give me a complete run down of what all parts I will need from the ALH? The BHW already has the balance shaft delete done
With the balance shaft delete done, here's what else you'll need:
Remove the crankshaft so you can swap the tone wheels for the crank sensor. The ALH will NOT fire with the PD crank tone wheel. It will think the engine is spinning 10x faster than it actually is (don't ask me how I know this--at least it wasn't an engine I put together).
Might as well throw all new rod and main bearings and bolts in to do that job, along with front and rear crank seals.
Speaking of, the PD timing belts are way wider than the ALH belts. This means the crank gear is wider, too. You will want to swap to the ALH crank sprocket with a new bolt.
You will also want an ALH front seal carrier, since it too also doesn't protrude as far for where the middle and lower timing belt covers bolt to. If you don't swap this the middle timing belt cover will have an interference issue with the accessory belt tensioner...
But, it turns out since the BHW had to make extra space for the much larger crank sprocket for the balance shaft, they moved ALL the bolts further out for that seal carrier. So, you'll have to drill and tap all new bolt holes for the ALH front seal carrier too.
And this is on top of having to drill and tap for the large lower roller bolt like you mentioned. You *might* have to redrill for the stud for the small lower roller, too. I don't know 100% if that is in the exact same location or not. Speaking of, you will want the shorter stud for that roller that is meant for the ALH so again you won't have interference issues with the lower/middle belt covers.