Honda 1300 Coupe Forum
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 1 
 on: November 20, 2020, 04:40:11 PM 
Started by RobertP - Last post by RobertP
Using Mr Tuttle's  suggestion I decided to replace the oil pump chain with a new go-cart chain, the one to get has a '219' pitch and the one I got also has a joining link (some don't). The difference in the amount of slack between the old and new is minimal so maybe the old chain would still have been OK.
I was able to compare piston rings from an old 1974 civic 1500 (EC) engine and found they are an exact fit so it would appear that any of the early 1500,1600 cc EC,EG,ED etc engines (74mm bore) use these rings and they seem to be readily available in std and oversize

 2 
 on: October 01, 2020, 03:13:16 AM 
Started by RichardH - Last post by RichardH
Hi Ian,
Thanks, the CB 750 looks similar and as you noted have been fitted. I wonder about the lack of outer steel case, maybe it has little effect.
I'll check further and report back when I've had the head apart and/or redone the seals.

 3 
 on: July 12, 2020, 03:35:53 AM 
Started by RichardH - Last post by IanT
Many years ago i was told cb750 valve stem seals fitted I have a had a valve regrind at a motor cycle repair shop and valve stem seals fitted plus some new and used caps fitted. Motor has been run but car has not on the road yet
 
Ian Tuttle

 4 
 on: May 06, 2020, 10:13:44 PM 
Started by RobertP - Last post by RobertP
As most would know there are a few engine components that are different between the 7 and the 9  apart from the obvious induction system, one of those is the camshaft, below is a photo of both a 9 and 7 camshaft. The difference at first glance is that the 9 shaft is slightly thinner and measuring them at a non-machined point the 9 has a diameter of 21mm and the 7 is 25.4mm, the weight of the 9 is 2.67kg and the 7 is 2.81kg, one has to ask why would Honda go to the trouble of using 2 different castings to machine the same item, the weight difference in negligible. One possible, but unlikely, reason is that the 7 could have an optional a/c compressor connected and more strength was needed, the 9 shaft has 'A-1' cast on it and the 7 has 'C-3'. You would also expect the 9 cam to be 'hotter' but my observations and measurement suggest otherwise, the distance from the heel to the nose of the lobe is 38.4mm and is the same on the inlet and exhaust on both shafts, so lift is identical, I was able to reasonably accurately compare(not measure) the lobe separation angle and they are the same. Looking closely at the asymmetric lobes they appear identical on both shafts, not very scientific I admit but if there is subtle differences to the lobes then I can't see it     

 5 
 on: April 24, 2020, 07:02:22 PM 
Started by RobertP - Last post by RobertP
These photos show the difference in length between a new and worn cam chain

 6 
 on: March 31, 2020, 09:56:01 PM 
Started by RichardH - Last post by RichardH
I've written to six manufacturers. Only Enginepro responded with a potential and ultimately referred me to Nason's in Sydney. A friend with a Nissan FJ20ET engine also checked and found the seal for his is very similar.
I ordered Nason's suggestion and Nissan equivalents. I'm still waiting for some info so this isn't conclusive.

The Nissan seal, as supplied, seems almost ideal except for the additional length. There's also no internal step as in the original. From the spec sheet
Stem OD  7.00
Guide OD 12.00
VSS Height 15.40
VSS Width 14.40

What I don't have is a guide or the ability to check, as my car's 100km away. Can anyone tell me what the height of the guide above head in the 1300 is?

The shorter "unknown application" seal is much shorter as you see, but may be a contender. The difference in seal diameter is interesting, they're all supposed to be for 7 mm stems, so my 1300 sample must be very worn or Honda made them a looser fit, maybe....

One of these may be "ideal" but I will confirm when I'm sure I can recommend one.

Please add your insights and/or guide info!

**Update**
ElringKlinger went to the trouble of searching by size and came up with this (thanks to them!):
Manufacturer: ELRING
Part Number: 112.593
Height [mm]: 12,7
Diameter 2 [mm]: 11,5 (ID)
Diameter 1 [mm]: 7 (Stem Dia,)
Diameter 3 [mm]: 16 (OD)
Material: ACM (Polyacrylate)
For Opel/Vauxhall - it's not steel encased but the measurements are extremely close.

 7 
 on: March 28, 2020, 04:16:33 AM 
Started by RichardH - Last post by RichardH
I moulded the internal cavity of the seal and rechecked/redrew the dimensions.

There are significant changes to the cross-section drawing, now 'REVB'. I previously thought there was a retaining recess, but after a more thorough clean and in better light, I see there isn't. The cup part is cylindrical above the lower angled lip to the upper seating step.

Given the improved representation, it may be that a more experienced person can recall a possible alternative which doesn't require machining the valve guide.

 8 
 on: March 24, 2020, 10:19:12 PM 
Started by RichardH - Last post by RichardH
Ian Wright has kindly sent me a valve, valve stem seal and the cap. They're not the same as the CB 450 (by a long shot).

Seal and cap images are attached below, as well as a "roughly" dimensioned drawing of the seal.

The seal seems to be longer than most of the same shape. Though very similar to many, I expect the dimensions, including internals like the seating recess are different to most I've located. Honda D series engines are roughly 5.5 mm, the 1300's are approximately 7.0 mm.

Ian was able to recover seals he already had (in parts motors etc.). He noted he doesn't bother replacing the upper cap, as it gets in the way of most repairs and adjustments and is of limited functionality.

The seal seems to be another of those unobtainable 1300 parts which, though inexpensive if available, can cost many hours searching for  or perhaps improvising.

Any suggestions or known substitutes? It would be great to get a sticky thread going on obscure suppliers, known substitutes and proven workarounds!

 9 
 on: March 21, 2020, 07:18:00 PM 
Started by RichardH - Last post by RichardH
I'm hoping to reduce the heavy smoking of my recent coupe 7 acquisition by replacing the valve seals and caps so I can road test it. I've only removed the rocker cover for this as yet (below). It looks like a fair amount of carbon deposit on most surfaces. The smoke is very thick, pale grey and has a lot of unburnt fuel.

The shop manual's not really clear enough and there are no parts dimensions, however from some research, it looks as if the parts described as the seal and cap are similar to the Honda CB450 motorcycle.

The CB450 stems are apparently 7.0 mm. Has anyone had experience replacing the caps and seals? Do the CB450 parts fit? Any alternatives?
The CB 450 parts seem to be as follows (from CMS and a few other motorcycle suppliers):
Cap, valve guide: 14791-283-020 (The terminology is slighly ambiguous)
Seal, valve stem: 14791-319-005
Images below.

The 1300 Coupe shop manual cites the stem and guide diameters as:
Inlet: 6.975 mm
Exhaust: 6.945 mm
Valve guide: 7.0 mm (limit 7.03mm)

The 1300 Coupe parts list on pages E51 and E52 has the following parts numbers.
Cap, valve: 12217-590-303
Seal, valve stem: 12210-590-000

There's an o-ring seal mid way on the valve guide but the guide has to be removed, not on the immediate agenda.

Richard

 10 
 on: March 08, 2020, 07:21:13 PM 
Started by RobertP - Last post by RobertP
Page 180 of the workshop manual describes how to remove the cooling fan using the special tool, it also says that if this tool is unavailable then it can be done by inserting the bolt loosely hitting it with a hammer and pulling on the fan at the same time. Well all I can say to that method is 'Good Luck'.  The fan is jammed on tight and requires plenty of effort. After doing a bit of research I found out that the required thread (30mm x1.5) was used for some hydraulic fittings so was able to obtain blocking plug with that thread from a supplier (Pirtek), drilled a hole in the centre and using a long 12mm bolt and nut made a suitable tool. It works the same as a bicycle crank remover but on a slightly larger scale but it requires a lot of effort and, be warned, because the shaft is tapered it releases suddenly with a loud bang.   

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