Our engines explained
#2
After watching this I understand now how easy is it for a cracked block to develop wow
and that top hat liners have nothing to do if s block will crack or not
I’m looking at a possible oil pump or worse bearings
if bearings I don’t think I wanna spend the money rebuilding a piece of junk block like this
if one day I decide to go with a Atlantic British block I hope they at least machined it correctly
and that top hat liners have nothing to do if s block will crack or not
I’m looking at a possible oil pump or worse bearings
if bearings I don’t think I wanna spend the money rebuilding a piece of junk block like this
if one day I decide to go with a Atlantic British block I hope they at least machined it correctly
#4
@redwhitekat yup old tech no precision, really this is nothing new for a 50 year old engine design, iron blocks had similar issues Over boring did not help as well as sloppy quality control, but the reality is an aluminum tube does not just crack.
A couple of possible causes :
A couple of possible causes :
- the wrong coolant , some anti freezes will attack aluminum cause oxidation and attack the aluminum creating weak spots.
- Over pressure from overheating will then further weaken those areas
- Overheating can also cause stress cracking
#5
I got one of the replacement 4.6 blocks in '07... Because my truck developed a loud tick literally after driving it off the dealer lot. They said it was the '03 issue and it was under warranty so free new engine... At the time I felt pretty good about getting a brand new engine in my new to me 4 year old truck. After about 160k miles and one head gasket job that engine developed a cracked block. I don't think highly of the replacement blocks they offered, probably the last off the line and the worst tolerances. The installing dealer broke it in with thin synthetic oil. It burned a quart of oil every 1000 miles for all of those 160k miles. Never ran Dexcool... Never overheated but did have a broken oil pump once and a ruptured front cover gasket once. HG's went out at about 100k on it. Really pretty normal block as expected except it started bubbling coolant into 5 without ever overheating.
Thats my story and I'm stickin to it.
Thats my story and I'm stickin to it.
Last edited by Dave03S; 08-05-2019 at 10:29 PM.
#7
#8
I think the blocks from turner and Atlantic British are used blocks from rovers. I wonder if someone can ask this question
#9
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Richard Gallant (08-06-2019)