1HDT Alternator bracket question

[nickolai]

Hi all,

I've just finished a cooling system refresh on my 1HDT in my HDJ81. New rad, all hoses, water pump, timing belt, tensioners etc.

I had brought a 110 amp alternator (the big body style one) to replace while i was in there, not realising that the alternator i have is the smaller 60 amp one. So, the big one won't fit.

I've since found that i can swap out the alternator adjusting bar to get the bigger alternator to fit. the bracket is retained by the 2 larger bolts on the water pump.

My question is, having done all this work, will removing the 2 big bolts that retain the alternator bracket damage the gasket seal? e.g. do i have to tear it all down again to replace the gasket and then replace the bracket? If this is the case then i'll just find a new smaller alternator.

Thoughts please!

 

[roscoFJ73]

I've since found that i can swap out the alternator adjusting bar to get the bigger alternator to fit. the bracket is retained by the 2 larger bolts on the water pump.

I dont recall seeing any bolts being shared by the alt bracket and water pump .

 

[nickolai]

I dont recall seeing any bolts being shared by the alt bracket and water pump .

The alternator tension adjusting bar is retained by the 2 left hand bolts on the water pump, the bigger, longer 14mm head ones.

These need to be removed to replace the bar with the right one, which is 16381-17020 for the bigger alternator.

A variation on this theme is discussed here: Mail Order Ride - My HDJ81

My question about the integrity of the water pump gasket if i remove the bolts to change the adjusting bar, to fit the larger alternator I have, or if is should search out the smaller body alternator.

 

[Douglas S]

The alternator tension adjusting bar is retained by the 2 left hand bolts on the water pump, the bigger, longer 14mm head ones.

These need to be removed to replace the bar with the right one, which is 16381-17020 for the bigger alternator.

A variation on this theme is discussed here: Mail Order Ride - My HDJ81

My question about the integrity of the water pump gasket if i remove the bolts to change the adjusting bar, to fit the larger alternator I have, or if is should search out the smaller body alternator.

I removed my bracket and the water pump seal started dripping (when the bolts were out). Reinstalled and retorqued and no issues in the years since.

 

[roscoFJ73]

The alternator tension adjusting bar is retained by the 2 left hand bolts on the water pump

Yes, I remember them now. How much it leaks might depend on whether you have a paper and sealant gasket, or the crush gasket. I think the paper and sealant will probably hold the seal better once the torque is off the bolt.
I would do it.

 

[Greg_B]

I removed and ground off some of the bracket so the larger 110 amp alternator I installed would work. No leaks since, Folks have also enlarged the holes for the bolts so the bracket can be tightened on a little higher arc. I have a 16381-17020 on the shelf now, for the next time I am into that area.

hth's
gb

 

[nickolai]

Thanks all. I'm going to order the bracket so i can swap the alternator, though I'm going to wait until after christmas to actually do the swap in case i pooch the gasket and need to tear it all down again!

In the meantime i'm going to keep looking for a replacement for the 27060-17160 small alt (which is a mission in itself)!

 

[Tapage]

non a issue when I swap in the tundra 150 amps alt ..

 

[nickolai]

non a issue when I swap in the tundra 150 amps alt ..

Thanks, we don't get Tundras down here and I'm looking to stay stock-ish.

Denso lists DAN1114 as their replacement:

Denso Diesel Alternator 80 amp - Cold Spec


but I'm going to cross check the measurements. I'll report back what i find here - lots of parts catalogues list the big alternator as the stock replacement and as we know this won't fit.