| Author | Topic |
|---|
Location:
Adelaide
Registered:
June 2003
|
|
18RG Con Rod Identification
|
Tue, 01 March 2005 00:15
|
 |
Hello all,
I was looking over some parts I have, supposedly from an 18RG and just wanted to compare some spec to some other people's 18RG bits.
The questions were raised because my spares are not the same as the con rods in my brother's 18RGU.
Question: Which con rods are 18RG(U)(E) genuine parts?
My Brother's
On my brother's ones, on the side that has the old toytota emblem on the big end of the inner part of the I-beam, there is also a protruding square shape made into them that is closer to the middle of the I-beam section.
My Spares:
My spare con rods do not have this square shaped protrusion made into them.
On the reverse side, on the gudgeon pin end, they have cast into them: 942M
On the side of this set, there is a protruding line cast into them that is ~5mm wide on the beam section and ~7mm wide around the Gudgeon pin bushing hole.
They also have oil squirters on the big end and an oil hole in the Gudgeon bushing hole.
If you are 100% sure that you have 18RG(U)(E) conrods, could you please give me a description of any landmark features.
Likewise, if you are 100% sure that you have 18R (C) conrods, could you please give me a description of any landmark features on those.
My peace of mind depends on you.
Thanks.
Steve M
|
|
|
Location:
Geelong, Vic
Registered:
November 2004
|
|
Re: 18RG Con Rod Identification
|
Tue, 01 March 2005 04:34
|
|
Steve
Ive just had a look in the shed. so this is what i can share with you.
on my second motor 88253 head the rods are marked thus, 3x 52BU 1x 52BM
i hope this doesnt muddy the waters any further 
|
|
|
Location:
Adelaide
Registered:
June 2003
|
|
Re: 18RG Con Rod Identification
|
Tue, 01 March 2005 08:42
|
|
Thanks phil,
That does muddy the waters a little, but any info is helpful.
My brother's engine had an 88253 head on it, the rest was mix'n'match though, so not too sure what the original purpose of his rods was.
Do your rods have the square protrusion on the other side of the I beam to the numbers?
Also where on teh rod were the number written?
Thank again
|
|
|
Location:
Adelaide
Registered:
June 2003
|
|
|
Location:
Adelaide
Registered:
September 2003
|
|
Re: 18RG Con Rod Identification
|
Wed, 02 March 2005 05:54
|
|
|
if you can wait a week or so i will be stripping a C in the shed and I can then get a piccie for you?
|
|
|
Location:
Adelaide
Registered:
June 2003
|
|
Re: 18RG Con Rod Identification
|
Wed, 02 March 2005 14:00
|
|
That would be truly brilliant, thanks.
Yes I can wait a week.
|
|
|
Location:
Tamworth
Registered:
August 2004
|
|
Re: 18RG Con Rod Identification
|
Thu, 03 March 2005 07:28
|
|
|
"walks to the shed" will be back in 5!
|
|
|
Location:
Tamworth
Registered:
August 2004
|
|
|
Location:
Adelaide
Registered:
June 2003
|
|
Re: 18RG Con Rod Identification
|
Thu, 03 March 2005 10:51
|
|
Well, now the waters are really muddy.
I think I do know the answers to two of the points that you raised.
1.
It seems that the number on the rod corresponds with a particular number from the bearing cap, rather than signifying that it came from cylinder 1, 2, 3 or 4.
Like they're a matching pair. (ie. 943M must have a no. 2 cap)
2.
The little T mark is also found on 18RG cam timing gears, I reckon it is just an outdated "Toyota" symbol. This symbol indicates the front of the con rod.
I have seen 61cm on these before, it may have been on my brother's set. I can't figure out what length it signified, though, the big end holes are 56mm ish.
I see that your's don't have the square protrusion half way down on the same side as the "T". I don't know if they only had these on earlier 18RG models or not (ie. before 88270 - EFI models).
From a closer inspection of the book it appears as though the curve out from the shaft to the pin hole is made differently between 18RG and 18R (C).
The 18R (C) ones have quite a small radius in their curve, and it starts closer to the hole.
The 18RG ones appear to have a larger radius, and it starts almost from the middle of the shaft.
I am closer to deciding that I definately have 18R single cam con rods for my spare set.
I need to hurry up with my paint job so that I can get onto ripping apart the whole 18RGEU I have waiting.
|
|
|
Location:
Brisbane
Registered:
October 2002
|
|
Re: 18RG Con Rod Identification
|
Mon, 07 March 2005 12:13
|
|
i have my 3 18RG rods here in front of me
they have the T symbol on them all
they have the square on them all
and 2 od them have 31EM and one has 31EU
those numbers could just be a batch ID number, maybe they dont mean shit
|
|
|
Location:
Adelaide
Registered:
June 2003
|
|
Re: 18RG Con Rod Identification
|
Mon, 07 March 2005 13:53
|
|
I reckon the key is the squares, at least on the older engines.
I found a 88250 series engine the other day at a swap meet and the conrods on that one had 33FU and some other like numbers and the squares.
I may be calling the guy tomorrow to pick up some bits, forged crank, 88231 cams, almost mint head and all that. It had a late model block on it though, with the dip stick on the correct side. Interesting.
The oil pump was something different, it had no spacer in it, like the later model engines had. It also had 8.5 written on the piston crowns, so I guess we should add that compression ration to the list (88232).
Thanks for the reply
|
|
|
Location:
Adelaide
Registered:
June 2003
|
|
Re: 18RG Con Rod Identification
|
Sun, 22 May 2005 02:55
|
|
Well, now I've finally got some of those square protrusion con rods.
casting numbers:
the one onfront of me is a 12GU.
This is definately different to the 942M from my spare lot.
They are visibly different.
The 12GU rod is have a much chunkier top end, the radius from the outside of the shaft to the outside of the small end starts about 2 thirds up the shaft and is consistent.
The 942M rod's radius from the shaft to the small end starts about 9mm down from the top of the shaft and is a tight curve. They also are about 35grams heavier than the supposed 18RGEU ones.
12GU - 792grams with cap (marked "1")and nuts
942M - 757grams with cap and nuts
the 18RG ones also have a slightly wider and much messier casting mark on their sides.
The 12GU rod's lower oil squirter is not countersunk from the crank side whereas the 942M's is.
The caps are also of slightly different appearance.
The 942M's no. 3 cap's thrust area has a larger cast lump on the front where it meets the lump of the rod than on the back.
The 12GU's no. 1 cap's thrust area has the same size lump on the frant as on the back.
If only I had a digital camera I could post up the pictures and show the differences.
|
|
|
