my b20b has a hairline crack where the oil pressure sending unit is.not in the threads but on the top. oil only drips when the motor is on. i have since replaced the shortblock. since the old block is just sitting there i wondered if it can be salvaged?

 

something similar happened to a buddies block.

i welded it, and we retapped it and it worked for at least a year, till he swapped out for a different motor config.

you can fix it. but its not a jb weld fix

 

yes sir. if i welded it , it would be done by a shop that knew what it was doing. what type of materieal is the block made out of? is it just alluminum or is it a diffrent type of alloy? is there a special type of welding material involved? thanks pornstar.

 

Aluminum, I had the best luck with 4043. Dirty but it welds ok.

Ian

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by qksl2 &raquo;</TD></TR><TR><TD CLASS="quote">Aluminum, I had the best luck with 4043. Dirty but it welds ok.

Ian</TD></TR></TABLE>thanks ian. i will bump this post up again in a few weeks after i get the time/funds to have it welded. thanks welding/fab forum.

 

bummping this thread back up from a year ago so i dont make a new thread............


NEW QUESTION.....how can i pressure test the short block after i have it welded? and should i take it to a radiator repair shop? seems like they might be good at welding aluminum. thanks.

 

i'd go for a cylinder head repair shop

 

I beg to differ. I JB welded my block and it held for 9 months! I wouldn't suggest it but it worked

 

lol jb weld kicks ***. i used to have an unopened tube in my trunk. came in handy when my old radiator cracked as a temp fix to get me home. i wouldnt use it on my block.......



will a cylinder head repair shop be able to pressure test my block?

 

if theres no holes, i don't think a pressure test is necessary, you don't build up too much pressure in the crankcase

 

its right on the oil pressure sending unit. so i guess it would just need to be strong enough to hold oil pressure, not crancase pressure. is there a difference?

 

yeah, lots of difference, oil pressure peaks at 80ish and is usually constant 60ish

crankcase pressure shouldn't be that high though

 

i JB welded a 5" crack accross the front of my sleeved B16 in the water Jacket. it held numerous heat cycles, and a dyno session. ended up pulling it for other reasons. I love JB weld. (we did try to tig it, but the crack kept spreading)