Builds What's a Parts Guy to Do?? (2 Viewers)

[Cruiserdrew]

I have this hazy memory the HG design was changed to reroute/control the flow of coolant through the head. I would use the later one, which ever that is.

 

[OGBeno]

Sorry-- There are three coolant holes in the head at the corners, not four.

 

[FJ60Cam]

I have this hazy memory the HG design was changed to reroute/control the flow of coolant through the head. I would use the later one, which ever that is.

That's what I've read, too.

You could go third-world style and just FIPG it

 

[Output Shaft]

Archedemus of Tarsus says:

My guess:
The bottom HG is the correct gasket. It was upgraded after (late) research of optimum water flow was conducted on the 2F head.
It is the same HG that I just installed.
Obviously there are more holes coming out of the block and holes in the head than are needed for optimum coolant circulation.
And I think that is the key word "optimum".
Just as much coolant will flow through the pump, but it is clear now that most of it is going to be flowing out of the back outboard hole next to the temperature sender.

They may have found that the head cools better (or maybe bubbles are released better) if the coolant flows all the way down the block and back through the head than diverting the flow along the way.

The factory manual that shows a cross section of the coolant flow always looked a little odd to me, as it seemed mighty peculiar that the coolant would flow in such a orderly manner up through all those holes all along the head. Water doesn't normally flow like that.

We'll both find out soon enough.

https://forum.ih8mud.com/attachments/headgasketcomparison-jpg.927962/

 

[Dynosoar]

Toyota engineers redesigned it for more effective flow. I would use the one in the bottom of the pic.
Dyno

 

[OGBeno]

Archedemus of Tarsus says:

My guess:
The bottom HG is the correct gasket. It was upgraded after (late) research of optimum water flow was conducted on the 2F head.
It is the same HG that I just installed.
Obviously there are more holes coming out of the block and holes in the head than are needed for optimum coolant circulation.
And I think that is the key word "optimum".
Just as much coolant will flow through the pump, but it is clear now that most of it is going to be flowing out of the back outboard hole next to the temperature sender.

They may have found that the head cools better (or maybe bubbles are released better) if the coolant flows all the way down the block and back through the head than diverting the flow along the way.

The factory manual that shows a cross section of the coolant flow always looked a little odd to me, as it seemed mighty peculiar that the coolant would flow in such a orderly manner up through all those holes all along the head. Water doesn't normally flow like that.

We'll both find out soon enough.

https://forum.ih8mud.com/attachments/headgasketcomparison-jpg.927962/

Great picture ... I should've searched!! Thank you.

 

[OGBeno]

Toyota engineers redesigned it for more effective flow. I would use the one in the bottom of the pic.
Dyno

Thanks Peter.

Nice talking today!

 

[FJ40Jim]

I have 2 HG's im able to use. The correct one (11115-61030) doesn't seem to have te correct cut outs for the water jacket holes in the block.
The incorrect one has three out of the 4 water jacket cutouts correct but like the later one closes off the one toward the front of the block on the DS.

Perplexed by this since it just does not make sense to make a HG and close off a water jacket hole.

This last bit is where the ass-u-me-ing will get you. What you call a water jacket hole, a casting engineer calls a core cleanout hole. The fact that the core cleanout holes can be used to access the coolant system is a happy coincidence.

Rule of thumb: on any engine where there are HG choices, the HG should match the head. Since the head on this engine is 85-newer, it should use the 85-newer HG.

Next question: Which headbolts to use? Early (strong), or late (cheap) ones?

 

[OGBeno]

This last bit is where the ass-u-me-ing will get you. What you call a water jacket hole, a casting engineer calls a core cleanout hole. The fact that the core cleanout holes can be used to access the coolant system is a happy coincidence.

Rule of thumb: on any engine where there are HG choices, the HG should match the head. Since the head on this engine is 85-newer, it should use the 85-newer HG.

Next question: Which headbolts to use? Early (strong), or late (cheap) ones?

Thank you Jim. I appreciate your expertise on these matters.

That said, 1980-1987 shows the same part number with no supersession for the head bolts: 90910-02050.

Are you talking about even earlier than 1980? 1975-1980 show's the same part number as well....

 

[FJ40Jim]

The PN has fully superceded. But there is a stronger headbolt used in 75-83. Replaced by a lightweight bolt for 84-newer.

I think the current catalog also shows the same PN for F engine? But they originally used a shatty bolt w/ separate washer. There was a PN for that bolt, and a PN for the separate, hardened M13 washer.

 

[Cruiserdrew]

O-I have a full set of 76 head bolts I can pull out of my junque 2F that I've never gotten rid of. You want? I can pull them over the weekend if needed.

 

[OGBeno]

O-I have a full set of 76 head bolts I can pull out of my junque 2F that I've never gotten rid of. You want? I can pull them over the weekend if needed.

Thanks Andy, but I think I am just going to go with the 15 I bought and have in stock.

Appreciate it though.

 

[OGBeno]

Always small updates with my build....

Got my new lifters in last night. They come nicely lubed in the bag from Toyota. I coated them in some moly-fortified engine building grease that I've been pretty much putting on all of the metal parts as I assemble them. Hoping to get the head on tonight since I don't have to be at work tomorrow morning.

Nicely lubed from the supplier.

Flat side down into the engine against the camshaft assy.

Indented side where the pushrods ride.

Installed in engine.

 

[GLTHFJ60]

Gotta love an update that contains about 60 seconds of actual work

I can't wait to see this thing in person.

 

[OGBeno]

Gotta love an update that contains about 60 seconds of actual work

I can't wait to see this thing in person.

It went like this Johnny:

1. #6
2. #6
3. Open bags for lifters
4. Grease them
5. #6
6. Take phone call
7. #6
8. Install lifters

That's way more than 1 minute.

 

[GLTHFJ60]

Hahahahahahhaaha

 

[FJ60Cam]

I see you used grease for #4

 

[OGBeno]

I see you used grease for #4

But of course. These are all each important discrete steps in a long process.

 

[spressomon]

I see you missed your thumb

 

[gregnash]

BUWAHAHAHAHAHA!!!!!