Engine Rebuild: 4.6 components in a 4.0
#1
Engine Rebuild: 4.6 components in a 4.0
Hello fellow Rovers, I just pulled my engine out of my ‘99 Disco 2 and had my heads/intake manifold sent out to a local shop to get them cleaned up. Currently down to the block and will be replacing the waterpump, power steering pump, Timing Chain, oil pump and installing a 4.6L camshaft, 4.6 crankshaft as well as the 4.6 connecting rods. I have a few questions that I’d like to be resolved prior to going any further:
1: can I run my stock 4.0 pistons with the 4.6 Crank and rods? Are there pros and cons to keeping the 4.0 pistons, or do I have to get the 4.6 pistons? For piston rings, I heard Hastings is the only way to go. Is that accurate?
2: I’ve heard you’re supposed to lubricate the oil pump since it’s going to be dry upon first engine start up, and that Vaseline isn’t good to use. What lubricant should I use instead?
3: is there any other things I should be thinking about replacing now that I’m this far into my rebuild? Any recommended parts?
4: I found some minimal rust in the metal inlet tube that flows coolant into the engine, (mounted on the front, not sure of part number), should I replace, or try to get it cleaned up?
I also am having trouble pulling the injectors out, any advise on how to accomplish this?
Thanks for everyone’s input!
#2
Subscribed. I have the same set up. 4.0 Coscast block w new top hat sleeves and can bearings, 4.6 con rods, 4.0 pistons, and some re-worked heads. Waiting on a good 4.6 crank to start the build. All my internals have about 30K. Debating whether to buy a new cam and lifters or use the existing Crower. I’ll most likely get new fuel injectors, coil packs, cam, crank, and knock sensors (all original w 237K).
The following users liked this post:
Stephen Perez (05-07-2019)
#3
The following users liked this post:
Stephen Perez (05-07-2019)
#4
#5
In regards to vaseline, how does it ever dissolve in Engine oil? I feel like it will always be circulated in the system...
I’m genuinely curious on all of this, especially the 4.0 pistons and what’s different about them from a 4.6 piston. According to Hasting’s ring specs they have the same diameter? Every post on ALL Rover forums don’t really have a “this is WHY” it always seems to be just speculation.
#6
#7
Alright, so I dropped my heads off at Cylinder Head in San Diego. Turns out Greg (the owner) agrees with the Rover specialist I’ve spoken to before that Hastings rings are the way to go in LR engines. Specifically Bosch engines. He cleaned and resurfaced my heads for a good price if anyone is in SoCal and needs head gaskets done.
Anyways, something he wasn’tsire of was the size difference between the 4.0 and 4.6 pistons. Is there a difference? Can you stick with the 4.0 pistons with 4.6 crank and connecting rods?
Anyways, something he wasn’tsire of was the size difference between the 4.0 and 4.6 pistons. Is there a difference? Can you stick with the 4.0 pistons with 4.6 crank and connecting rods?
#8
Update
I ended up talking to a local shop who works on Bosch engines. Apparently Hastings piston rings are what he orders.
Im still trying to figure out if there is a size difference in pistons between the 4.0 and 4.6. Any guidance would be great!
i also ended up ordering a new Elbow for the coolant just because of the rust. I figure getting rust particles in the coolant isn’t the best thing for the engine
Im still trying to figure out if there is a size difference in pistons between the 4.0 and 4.6. Any guidance would be great!
i also ended up ordering a new Elbow for the coolant just because of the rust. I figure getting rust particles in the coolant isn’t the best thing for the engine
#10
I ended up talking to a local shop who works on Bosch engines. Apparently Hastings piston rings are what he orders.
Im still trying to figure out if there is a size difference in pistons between the 4.0 and 4.6. Any guidance would be great!
i also ended up ordering a new Elbow for the coolant just because of the rust. I figure getting rust particles in the coolant isn’t the best thing for the engine
Im still trying to figure out if there is a size difference in pistons between the 4.0 and 4.6. Any guidance would be great!
i also ended up ordering a new Elbow for the coolant just because of the rust. I figure getting rust particles in the coolant isn’t the best thing for the engine