DanielH

oh sorry, I should have mentioned, that the bottom picture shows the old shells as comparison.

Hi there, I had a closer look at the shells over the weekend... The caps and rods are not mixed up, they all have figures (1-6) which line up properly. I guess the problem is with the shells: I placed them on a flat surface (mirror) and noticed, that some of them are bent: see foto below. The old shells are perfectly flat at the edges: see foto below. Some shells are only slightly bent, i.e. when I screw caps and rods together, I am able to correct the misalignment by providing a bit lateral pressure until the bolts are fully fastened. I am now returning the set of shells to Rimmerbros and get a different one from somewhere else. Any recommendations for a good source? thank you 🙂 Dan

While we are waiting for Rimmerbros' reaction, we can have a look at the boxes of the shells:

Hi there, the machinist has reported back, that _none_ of new big end bearing shells line up properly: see attached fotos. I've contacted Rimmerbr0s to hear what they have to say about that issue...

Hello, I just want a standard rebuild, without frills. Cylinder bores The cylinders have been bored to match +0.020 oversize pistons. I purchased the "county" pistons from rimmerbr0s: https://rimmerbros.com/Item--i-149976020COUNTY I was unable to find information about the manufacturer etc. Rimmer wrote: "This is the Hepolite page, our CP800 is a reverse engineering 19270. The spec would be 020 on top of this. The piston to bore clearance on this piston is 0.002-0.00252" Main bearings All the journals were in spec but some showed marks like this one: see attached. Grinded to fit +0.010 oversize bearings from Glyco: https://rimmerbros.com/Item--i-144194010 Big end bearings Grinded to fit +0.010 oversize bearings from Glyco: https://rimmerbros.com/Item--i-RTC1751010

Hi there, long time lurker here...I found this forum really helpful sofar, so i decided i would ask you guys to guide me during my first engine rebuild. So I am planning to post the various project stages here and I hope you could help me out with your informed crowd wisdom 😉 I am not new to mechanical work on pre-70ies Jaguars and Triumphs, but this my first engine rebuild. Engine number is KD56475 E Current stage is: engine returned from machinist. So, I am looking forward your input! thanks Dan

WOW, you've got a copy of that note?

Hi there, my assumption is, that the County pistons are rather common in Triumph engine rebuild projects. Am I right? That manufacturer appears to be really opaque...no data, no address, even not in the parcel. How do your machinists cope with that? Do they look at the pistons and say: thats cast, so I go with the rule of thumb: clearance is 1% of dia?? Any thoughts? Thank you 🙂 Daniel

Oh, Rimmerbros just coughed up: "Unfortunately we do not have a datasheet available, however the county part number is [b]CP800K 020[/b]."

The data from Vizard is for the 4 cyl... I just overlooked that info bc it is given in the previous column in the text... oh my...

Hi there, my machinist is asking which clearance for the block bore he should account for? He is saying that the clearance depends on the particular make of the piston, which makes sense to me. I've provided him with the +20thou pistons from County: https://rimmerbros.com/Item--i-149976020COUNTY The County parts number is 149976. I am unable to get a datasheet from either Rimmerbros or from the manufacturer even. What's written in the books? 1. The handbook says (pp 42): Pistons are available 0.02 (0.508 mm) oversize. Before fitting, the cylinder block should be rebored to 2.9614/2.9609 (73.685/73.683mm) to suit the oversize pistons, Piston dia: 2.937+0.02 (74.600+0,508mm) = 2.957 (75.1078mm) 2. Vizard says (pp 11): In the standard bores the pistons are graded in three different sizes and the bore clearance on a new engine will be between 3.5 thou and 4.2 thou (0.0035-0.0042). Any thoughts? thanks Daniel